Automatically generated registrants for web plugins (#39628)

* WIP on web plugin registry

* WIP on registering plugins

* WIP on web plugin registration

* Only generate `package:flutter_web_plugins` imports if plugins are
defined

* Add parsing test

* Add documentation

* Fix analyzer warnings

* add license headers

* Add tests for package:flutter_web_plugins

* Run `flutter update-packages --force-upgrade`

* Fix analyzer errors

* Fix analyzer error in test

* Update copyright and remove flutter SDK constraints

* Enable tests since engine has rolled

* add flutter_web_plugins tests to bots

* Create an empty .packages file for WebFs test

dev/benchmarks/complex_layout/pubspec.yaml

@@ -22,7 +22,7 @@ dependencies:
   collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   json_rpc_2: 2.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   meta: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -86,4 +86,4 @@ flutter:
     - packages/flutter_gallery_assets/people/square/ali.png
     - packages/flutter_gallery_assets/places/india_chettinad_silk_maker.png
 
-# PUBSPEC CHECKSUM: 4c13
+# PUBSPEC CHECKSUM: 20df

dev/benchmarks/macrobenchmarks/pubspec.yaml

@@ -22,7 +22,7 @@ dependencies:
   collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   json_rpc_2: 2.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   meta: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -83,4 +83,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 4c13
+# PUBSPEC CHECKSUM: 20df

dev/bots/pubspec.yaml

@@ -17,7 +17,7 @@ dependencies:
   googleapis: 0.54.0
   googleapis_auth: 0.2.10
 
-  _discoveryapis_commons: 0.1.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  _discoveryapis_commons: 0.1.8+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   analyzer: 0.36.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   async: 2.3.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   boolean_selector: 1.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -26,7 +26,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -67,4 +67,4 @@ dev_dependencies:
   mockito: 4.1.0
   test_api: 0.2.5
 
-# PUBSPEC CHECKSUM: 0eb3
+# PUBSPEC CHECKSUM: f181

dev/bots/test.dart

@@ -474,6 +474,7 @@ Future<void> _runWebTests() async {
     // 'test/widgets/',
     // 'test/material/',
   ]);
+  await _runFlutterWebTest(path.join(flutterRoot, 'packages', 'flutter_web_plugins'), tests: <String>['test']);
 }
 
 Future<void> _runCoverage() async {

dev/devicelab/pubspec.yaml

@@ -9,7 +9,7 @@ environment:
 
 dependencies:
   args: 1.5.2
-  file: 5.0.8+1
+  file: 5.0.10
   image: 2.1.4
   meta: 1.1.7
   path: 1.6.4
@@ -73,4 +73,4 @@ dev_dependencies:
   watcher: 0.9.7+12 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   yaml: 2.1.16 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
 
-# PUBSPEC CHECKSUM: c82c
+# PUBSPEC CHECKSUM: 9cf8

dev/integration_tests/android_semantics_testing/pubspec.yaml

@@ -17,7 +17,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -63,4 +63,4 @@ dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 22cd
+# PUBSPEC CHECKSUM: 4e9a

dev/integration_tests/android_splash_screens/splash_screen_kitchen_sink/pubspec.yaml

@@ -51,7 +51,7 @@ dev_dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -133,4 +133,4 @@ flutter:
   # For details regarding fonts from package dependencies,
   # see https://flutter.dev/custom-fonts/#from-packages
 
-# PUBSPEC CHECKSUM: 19b8
+# PUBSPEC CHECKSUM: 0a85

dev/integration_tests/android_splash_screens/splash_screen_trans_rotate/pubspec.yaml

@@ -51,7 +51,7 @@ dev_dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -133,4 +133,4 @@ flutter:
   # For details regarding fonts from package dependencies,
   # see https://flutter.dev/custom-fonts/#from-packages
 
-# PUBSPEC CHECKSUM: 19b8
+# PUBSPEC CHECKSUM: 0a85

dev/integration_tests/android_views/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   charcode: 1.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   json_rpc_2: 2.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   meta: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -80,4 +80,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 45da
+# PUBSPEC CHECKSUM: 7fa7

dev/integration_tests/channels/pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -67,4 +67,4 @@ dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 22cd
+# PUBSPEC CHECKSUM: 4e9a

dev/integration_tests/codegen/pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
   collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   json_rpc_2: 2.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   meta: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -74,4 +74,4 @@ builders:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 22cd
+# PUBSPEC CHECKSUM: 4e9a

dev/integration_tests/external_ui/pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -67,4 +67,4 @@ dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 22cd
+# PUBSPEC CHECKSUM: 4e9a

dev/integration_tests/flavors/pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -67,4 +67,4 @@ dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 22cd
+# PUBSPEC CHECKSUM: 4e9a

dev/integration_tests/platform_interaction/pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -67,4 +67,4 @@ dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 22cd
+# PUBSPEC CHECKSUM: 4e9a

dev/integration_tests/ui/pubspec.yaml

@@ -23,7 +23,7 @@ dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -77,4 +77,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 2b14
+# PUBSPEC CHECKSUM: 65e0

dev/tools/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   http_parser: 3.1.3 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   pedantic: 1.8.0+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   platform: 2.2.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -37,4 +37,4 @@ dev_dependencies:
   stack_trace: 1.9.3 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   stream_channel: 2.0.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
 
-# PUBSPEC CHECKSUM: 8220
+# PUBSPEC CHECKSUM: 9cec

examples/catalog/pubspec.yaml

@@ -31,7 +31,7 @@ dev_dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -77,4 +77,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 2b14
+# PUBSPEC CHECKSUM: 65e0

examples/flutter_gallery/pubspec.yaml

@@ -10,7 +10,7 @@ dependencies:
   collection: 1.14.11
   device_info: 0.4.0+2
   intl: 0.15.8
-  connectivity: 0.4.3+7
+  connectivity: 0.4.4
   string_scanner: 1.0.5
   url_launcher: 5.1.2
   cupertino_icons: 0.1.2
@@ -46,7 +46,7 @@ dev_dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -258,4 +258,4 @@ flutter:
       - asset: packages/flutter_gallery_assets/fonts/merriweather/Merriweather-Regular.ttf
       - asset: packages/flutter_gallery_assets/fonts/merriweather/Merriweather-Light.ttf
 
-# PUBSPEC CHECKSUM: 2aad
+# PUBSPEC CHECKSUM: 3f19

examples/platform_channel/pubspec.yaml

@@ -29,7 +29,7 @@ dev_dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -76,4 +76,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 2b14
+# PUBSPEC CHECKSUM: 65e0

examples/platform_channel_swift/pubspec.yaml

@@ -29,7 +29,7 @@ dev_dependencies:
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   csslib: 0.16.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   front_end: 0.1.19 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   glob: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   html: 0.14.0+2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -76,4 +76,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: 2b14
+# PUBSPEC CHECKSUM: 65e0

examples/stocks/pubspec.yaml

@@ -50,7 +50,7 @@ dev_dependencies:
 
   archive: 2.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   boolean_selector: 1.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   image: 2.1.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   json_rpc_2: 2.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   matcher: 0.12.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -65,4 +65,4 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
-# PUBSPEC CHECKSUM: ded4
+# PUBSPEC CHECKSUM: 27a1

packages/flutter/pubspec.yaml

@@ -31,7 +31,7 @@ dev_dependencies:
   charcode: 1.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   image: 2.1.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   matcher: 0.12.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -49,4 +49,4 @@ dev_dependencies:
   test_api: 0.2.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   xml: 3.5.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
 
-# PUBSPEC CHECKSUM: 8060
+# PUBSPEC CHECKSUM: 012d

packages/flutter_driver/pubspec.yaml

@@ -8,7 +8,7 @@ environment:
   sdk: ">=2.0.0-dev.68.0 <3.0.0"
 
 dependencies:
-  file: 5.0.8+1
+  file: 5.0.10
   json_rpc_2: 2.1.0
   meta: 1.1.7
   path: 1.6.4
@@ -51,4 +51,4 @@ dev_dependencies:
   mockito: 4.1.0
   quiver: 2.0.5
 
-# PUBSPEC CHECKSUM: 70d0
+# PUBSPEC CHECKSUM: 8a9d

packages/flutter_goldens/pubspec.yaml

@@ -8,7 +8,7 @@ dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
   flutter_test:
     sdk: flutter
-  file: 5.0.8+1
+  file: 5.0.10
   meta: 1.1.7
   platform: 2.2.1
   process: 3.0.11
@@ -43,4 +43,4 @@ dependencies:
 dev_dependencies:
   mockito: 4.1.0
 
-# PUBSPEC CHECKSUM: 8060
+# PUBSPEC CHECKSUM: 012d

packages/flutter_goldens_client/pubspec.yaml

@@ -6,7 +6,7 @@ environment:
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
-  file: 5.0.8+1
+  file: 5.0.10
   platform: 2.2.1
   process: 3.0.11
 
@@ -18,4 +18,4 @@ dartdoc:
   # Exclude this package from the hosted API docs.
   nodoc: true
 
-# PUBSPEC CHECKSUM: 4cbd
+# PUBSPEC CHECKSUM: 2f8a

packages/flutter_test/pubspec.yaml

@@ -50,8 +50,8 @@ dependencies:
   xml: 3.5.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
 
 dev_dependencies:
-  file: 5.0.8+1
+  file: 5.0.10
 
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
 
-# PUBSPEC CHECKSUM: 9be7
+# PUBSPEC CHECKSUM: b5b4

packages/flutter_tools/lib/src/build_runner/build_script.dart

@@ -86,7 +86,10 @@ final List<core.BuilderApplication> builders = <core.BuilderApplication>[
   core.apply(
     'flutter_tools:shell',
     <BuilderFactory>[
-      (BuilderOptions options) => const FlutterWebShellBuilder(),
+      (BuilderOptions options) {
+        final bool hasPlugins = options.config['hasPlugins'] == true;
+        return FlutterWebShellBuilder(hasPlugins: hasPlugins);
+      }
     ],
     core.toRoot(),
     hideOutput: true,
@@ -342,7 +345,9 @@ void setStackTraceMapper(StackTraceMapper mapper) {
 
 /// A shell builder which generates the web specific entrypoint.
 class FlutterWebShellBuilder implements Builder {
-  const FlutterWebShellBuilder();
+  const FlutterWebShellBuilder({this.hasPlugins = false});
+
+  final bool hasPlugins;
 
   @override
   Future<void> build(BuildStep buildStep) async {
@@ -352,16 +357,33 @@ class FlutterWebShellBuilder implements Builder {
       return;
     }
     final AssetId outputId = buildStep.inputId.changeExtension('_web_entrypoint.dart');
-    await buildStep.writeAsString(outputId, '''
+    if (hasPlugins) {
+      await buildStep.writeAsString(outputId, '''
 import 'dart:ui' as ui;
+
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+
+import 'generated_plugin_registrant.dart';
+import "${path.url.basename(buildStep.inputId.path)}" as entrypoint;
+
+Future<void> main() async {
+  registerPlugins(webPluginRegistry);
+  await ui.webOnlyInitializePlatform();
+  entrypoint.main();
+}
+''');
+    } else {
+      await buildStep.writeAsString(outputId, '''
+import 'dart:ui' as ui;
+
 import "${path.url.basename(buildStep.inputId.path)}" as entrypoint;
 
 Future<void> main() async {
   await ui.webOnlyInitializePlatform();
   entrypoint.main();
 }
-
 ''');
+    }
   }
 
   @override

packages/flutter_tools/lib/src/build_runner/web_compilation_delegate.dart

@@ -57,6 +57,7 @@ class BuildRunnerWebCompilationProxy extends WebCompilationProxy {
     _packageUriMapper = PackageUriMapper(
         path.absolute('lib/main.dart'), PackageMap.globalPackagesPath, null, null);
     _packageGraph = core.PackageGraph.forPath(projectDirectory.path);
+
     final core.BuildEnvironment buildEnvironment = core.OverrideableEnvironment(
         core.IOEnvironment(_packageGraph), onLog: (LogRecord record) {
       if (record.level == Level.SEVERE || record.level == Level.SHOUT) {

packages/flutter_tools/lib/src/build_runner/web_fs.dart

@@ -31,6 +31,8 @@ import '../bundle.dart';
 import '../cache.dart';
 import '../dart/package_map.dart';
 import '../globals.dart';
+import '../platform_plugins.dart';
+import '../plugins.dart';
 import '../project.dart';
 import '../web/chrome.dart';
 
@@ -38,7 +40,7 @@ import '../web/chrome.dart';
 const String kBuildTargetName = 'web';
 
 /// A factory for creating a [Dwds] instance.
-DwdsFactory get dwdsFactpory => context.get<DwdsFactory>() ?? Dwds.start;
+DwdsFactory get dwdsFactory => context.get<DwdsFactory>() ?? Dwds.start;
 
 /// The [BuildDaemonCreator] instance.
 BuildDaemonCreator get buildDaemonCreator => context.get<BuildDaemonCreator>() ?? const BuildDaemonCreator();
@@ -49,10 +51,10 @@ WebFsFactory get webFsFactory => context.get<WebFsFactory>() ?? WebFs.start;
 /// A factory for creating an [HttpMultiServer] instance.
 HttpMultiServerFactory get httpMultiServerFactory => context.get<HttpMultiServerFactory>() ?? HttpMultiServer.bind;
 
-/// A function with the same signature as [HttpMultiServier.bind].
+/// A function with the same signature as [HttpMultiServer.bind].
 typedef HttpMultiServerFactory = Future<HttpServer> Function(dynamic address, int port);
 
-/// A function with the same signatire as [Dwds.start].
+/// A function with the same signature as [Dwds.start].
 typedef DwdsFactory = Future<Dwds> Function({
   @required int applicationPort,
   @required int assetServerPort,
@@ -144,9 +146,11 @@ class WebFs {
     if (!flutterProject.dartTool.existsSync()) {
       flutterProject.dartTool.createSync(recursive: true);
     }
+
+    final bool hasWebPlugins = findPlugins(flutterProject).any((Plugin p) => p.platforms.containsKey(WebPlugin.kConfigKey));
     // Start the build daemon and run an initial build.
     final BuildDaemonClient client = await buildDaemonCreator
-      .startBuildDaemon(fs.currentDirectory.path, release: buildInfo.isRelease, profile: buildInfo.isProfile);
+      .startBuildDaemon(fs.currentDirectory.path, release: buildInfo.isRelease, profile: buildInfo.isProfile, hasPlugins: hasWebPlugins);
     client.startBuild();
     // Only provide relevant build results
     final Stream<BuildResult> filteredBuildResults = client.buildResults
@@ -163,7 +167,7 @@ class WebFs {
 
     // Initialize the dwds server.
     final int port = await os.findFreePort();
-    final Dwds dwds = await dwdsFactpory(
+    final Dwds dwds = await dwdsFactory(
       hostname: _kHostName,
       applicationPort: port,
       applicationTarget: kBuildTargetName,
@@ -307,12 +311,13 @@ class BuildDaemonCreator {
   static const String _ignoredLine3 = 'have your dependencies specified fully in your pubspec.yaml';
 
   /// Start a build daemon and register the web targets.
-  Future<BuildDaemonClient> startBuildDaemon(String workingDirectory, {bool release = false, bool profile = false }) async {
+  Future<BuildDaemonClient> startBuildDaemon(String workingDirectory, {bool release = false, bool profile = false, bool hasPlugins = false}) async {
     try {
       final BuildDaemonClient client = await _connectClient(
         workingDirectory,
         release: release,
         profile: profile,
+        hasPlugins: hasPlugins,
       );
       _registerBuildTargets(client);
       return client;
@@ -339,7 +344,7 @@ class BuildDaemonCreator {
 
   Future<BuildDaemonClient> _connectClient(
     String workingDirectory,
-    { bool release, bool profile }
+    { bool release, bool profile, bool hasPlugins }
   ) {
     final String flutterToolsPackages = fs.path.join(Cache.flutterRoot, 'packages', 'flutter_tools', '.packages');
     final String buildScript = fs.path.join(Cache.flutterRoot, 'packages', 'flutter_tools', 'lib', 'src', 'build_runner', 'build_script.dart');
@@ -360,6 +365,7 @@ class BuildDaemonCreator {
         '--define', 'flutter_tools:entrypoint=release=$release',
         '--define', 'flutter_tools:entrypoint=profile=$profile',
         '--define', 'flutter_tools:shell=flutterWebSdk=$flutterWebSdk',
+        '--define', 'flutter_tools:shell=hasPlugins=$hasPlugins',
       ],
       logHandler: (ServerLog serverLog) {
         switch (serverLog.level) {
@@ -392,4 +398,4 @@ class BuildDaemonCreator {
     final String portFilePath = fs.path.join(daemonWorkspace(workingDirectory.path), '.asset_server_port');
     return int.tryParse(fs.file(portFilePath).readAsStringSync());
   }
-}
+}

packages/flutter_tools/lib/src/platform_plugins.dart

@@ -139,3 +139,54 @@ class MacOSPlugin extends PluginPlatform {
     };
   }
 }
+
+/// Contains the parameters to template a web plugin.
+///
+/// The required fields include: [name] of the plugin, the [pluginClass] that will
+/// be the entry point to the plugin's implementation, and the [fileName]
+/// containing the code.
+class WebPlugin extends PluginPlatform {
+  const WebPlugin({
+    @required this.name,
+    @required this.pluginClass,
+    @required this.fileName,
+  });
+
+  factory WebPlugin.fromYaml(String name, YamlMap yaml) {
+    assert(validate(yaml));
+    return WebPlugin(
+      name: name,
+      pluginClass: yaml['pluginClass'],
+      fileName: yaml['fileName'],
+    );
+  }
+
+  static bool validate(YamlMap yaml) {
+    if (yaml == null) {
+      return false;
+    }
+    return yaml['pluginClass'] is String && yaml['fileName'] is String;
+  }
+
+  static const String kConfigKey = 'web';
+
+  /// The name of the plugin.
+  final String name;
+
+  /// The class containing the plugin implementation details.
+  ///
+  /// This class should have a static `registerWith` method defined.
+  final String pluginClass;
+
+  /// The name of the file containing the class implementation above.
+  final String fileName;
+
+  @override
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'name': name,
+      'class': pluginClass,
+      'file': fileName,
+    };
+  }
+}

packages/flutter_tools/lib/src/plugins.dart

@@ -89,6 +89,11 @@ class Plugin {
           MacOSPlugin.fromYaml(name, platformsYaml[MacOSPlugin.kConfigKey]);
     }
 
+    if (platformsYaml[WebPlugin.kConfigKey] != null) {
+      platforms[WebPlugin.kConfigKey] =
+          WebPlugin.fromYaml(name, platformsYaml[WebPlugin.kConfigKey]);
+    }
+
     return Plugin(
       name: name,
       path: path,
@@ -384,6 +389,25 @@ Depends on all your plugins, and provides a function to register them.
 end
 ''';
 
+const String _dartPluginRegistryTemplate = '''//
+// Generated file. Do not edit.
+//
+import 'dart:ui';
+
+{{#plugins}}
+import 'package:{{name}}/{{file}}';
+{{/plugins}}
+
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+
+void registerPlugins(PluginRegistry registry) {
+{{#plugins}}
+  {{class}}.registerWith(registry.registrarFor({{class}}));
+{{/plugins}}
+  registry.registerMessageHandler();
+}
+''';
+
 Future<void> _writeIOSPluginRegistrant(FlutterProject project, List<Plugin> plugins) async {
   final List<Map<String, dynamic>> iosPlugins = _extractPlatformMaps(plugins, IOSPlugin.kConfigKey);
   final Map<String, dynamic> context = <String, dynamic>{
@@ -439,6 +463,29 @@ Future<void> _writeMacOSPluginRegistrant(FlutterProject project, List<Plugin> pl
   );
 }
 
+Future<void> _writeWebPluginRegistrant(FlutterProject project, List<Plugin> plugins) async {
+  final List<Map<String, dynamic>> webPlugins = _extractPlatformMaps(plugins, WebPlugin.kConfigKey);
+  final Map<String, dynamic> context = <String, dynamic>{
+    'plugins': webPlugins,
+  };
+  final String registryDirectory = project.web.libDirectory.path;
+  final String filePath = fs.path.join(registryDirectory, 'generated_plugin_registrant.dart');
+  if (webPlugins.isEmpty) {
+    final File file = fs.file(filePath);
+    file.createSync(recursive: true);
+    file.writeAsStringSync('''
+// Generated file. Intentionally left empty due to no web plugins registered.
+void registerPlugins(ignored) {}
+''');
+  } else {
+    _renderTemplateToFile(
+      _dartPluginRegistryTemplate,
+      context,
+      filePath,
+    );
+  }
+}
+
 /// Rewrites the `.flutter-plugins` file of [project] based on the plugin
 /// dependencies declared in `pubspec.yaml`.
 ///
@@ -490,6 +537,9 @@ Future<void> injectPlugins(FlutterProject project, {bool checkProjects = false})
     }
   }
   }
+  if (featureFlags.isWebEnabled && project.web.existsSync()) {
+    await _writeWebPluginRegistrant(project, plugins);
+  }
 }
 
 /// Returns whether the specified Flutter [project] has any plugin dependencies.

packages/flutter_tools/lib/src/project.dart

@@ -623,6 +623,9 @@ class WebProject {
       && indexFile.existsSync();
   }
 
+  /// The 'lib' directory for the application.
+  Directory get libDirectory => parent.directory.childDirectory('lib');
+
   /// The html file used to host the flutter web application.
   File get indexFile => parent.directory
       .childDirectory('web')

packages/flutter_tools/lib/src/web/chrome.dart

@@ -140,7 +140,6 @@ class ChromeLauncher {
         await chrome.chromeConnection.getTabs();
       } catch (e) {
         await chrome.close();
-        print('here');
         throwToolExit(
             'Unable to connect to Chrome debug port: ${chrome.debugPort}\n $e');
       }

packages/flutter_tools/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
   completion: 0.2.1+1
   coverage: 0.13.2
   crypto: 2.1.2
-  file: 5.0.8+1
+  file: 5.0.10
   http: 0.12.0+2
   intl: 0.15.8
   json_rpc_2: 2.1.0
@@ -134,4 +134,4 @@ dartdoc:
   # Exclude this package from the hosted API docs.
   nodoc: true
 
-# PUBSPEC CHECKSUM: fb35
+# PUBSPEC CHECKSUM: 0702

packages/flutter_tools/test/general.shard/plugin_parsing_test.dart

@@ -42,7 +42,10 @@ void main() {
           '  package: com.flutter.dev\n'
           '  pluginClass: ASamplePlugin\n'
           ' ios:\n'
-          '  pluginClass: ISamplePlugin\n';
+          '  pluginClass: ISamplePlugin\n'
+          ' web:\n'
+          '  pluginClass: WSamplePlugin\n'
+          '  fileName: web_plugin.dart\n';
 
       final dynamic pluginYaml = loadYaml(pluginYamlRaw);
       final Plugin plugin =
@@ -53,6 +56,7 @@ void main() {
       final MacOSPlugin macOSPlugin =
           plugin.platforms[MacOSPlugin.kConfigKey];
       final IOSPlugin iosPlugin = plugin.platforms[IOSPlugin.kConfigKey];
+      final WebPlugin webPlugin = plugin.platforms[WebPlugin.kConfigKey];
       final String androidPluginClass = androidPlugin.pluginClass;
       final String iosPluginClass = iosPlugin.pluginClass;
 
@@ -61,6 +65,8 @@ void main() {
       expect(iosPlugin.classPrefix, '');
       expect(androidPlugin.package, 'com.flutter.dev');
       expect(macOSPlugin.pluginClass, 'MSamplePlugin');
+      expect(webPlugin.pluginClass, 'WSamplePlugin');
+      expect(webPlugin.fileName, 'web_plugin.dart');
     });
   });
 }

packages/flutter_tools/test/general.shard/web/web_fs_test.dart

@@ -46,6 +46,11 @@ void main() {
     });
     when(mockBuildDaemonCreator.assetServerPort(any)).thenReturn(4321);
     testbed = Testbed(
+      setup: () {
+        // Create an empty .packages file so we can read it when we check for
+        // plugins on WebFs.start()
+        fs.file('.packages').createSync();
+      },
       overrides: <Type, Generator>{
         OperatingSystemUtils: () => mockOperatingSystemUtils,
         BuildDaemonCreator: () => mockBuildDaemonCreator,

packages/flutter_web_plugins/BUILD.gn

@@ -0,0 +1,18 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/dart/dart_library.gni")
+
+dart_library("flutter_web_plugins") {
+  package_name = "flutter_web_plugins"
+
+  # Can be left empty as analysis is disabled.
+  sources = []
+
+  disable_analysis = true
+
+  deps = [
+    "../flutter",
+  ]
+}

packages/flutter_web_plugins/lib/flutter_web_plugins.dart

@@ -0,0 +1,5 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+export 'src/plugin_registry.dart';

packages/flutter_web_plugins/lib/src/plugin_registry.dart

@@ -0,0 +1,121 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:ui' as ui;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+typedef _MessageHandler = Future<ByteData> Function(ByteData);
+
+/// This class registers web platform plugins.
+class PluginRegistry {
+  /// Creates a plugin registry.
+  PluginRegistry(this._binaryMessenger);
+
+  final BinaryMessenger _binaryMessenger;
+
+  /// Creates a registrar for the given plugin implementation class.
+  Registrar registrarFor(Type key) => Registrar(_binaryMessenger);
+
+  /// Registers this plugin handler with the engine, so that unrecognized
+  /// platform messages are forwarded to the registry, where they can be
+  /// correctly dispatched to one of the registered plugins.
+  void registerMessageHandler() {
+    // The function below is only defined in the Web dart:ui.
+    // ignore: undefined_function
+    ui.webOnlySetPluginHandler(_binaryMessenger.handlePlatformMessage);
+  }
+}
+
+/// A registrar for a particular plugin.
+///
+/// Gives access to a [BinaryMessenger] which has been configured to receive
+/// platform messages from the framework side.
+class Registrar {
+  /// Creates a registrar with the given [BinaryMessenger].
+  Registrar(this.messenger);
+
+  /// A [BinaryMessenger] configured to receive platform messages from the
+  /// framework side.
+  ///
+  /// Use this [BinaryMessenger] when creating platform channels in order for
+  /// them to receive messages from the platform side. For example:
+  ///
+  ///
+  ///     class MyPlugin {
+  ///       static void registerWith(Registrar registrar) {
+  ///         final MethodChannel channel = MethodChannel(
+  ///             'com.my_plugin/my_plugin',
+  ///             const StandardMethodCodec(),
+  ///             registrar.messenger);
+  ///         final MyPlugin instance = MyPlugin();
+  ///         channel.setMethodCallHandler(instance.handleMethodCall);
+  ///       }
+  ///       ...
+  ///     }
+  final BinaryMessenger messenger;
+}
+
+/// The default plugin registry for the web.
+final PluginRegistry webPluginRegistry = PluginRegistry(pluginBinaryMessenger);
+
+/// A [BinaryMessenger] which does the inverse of the default framework
+/// messenger.
+///
+/// Instead of sending messages from the framework to the engine, this
+/// receives messages from the framework and dispatches them to registered
+/// plugins.
+class _PlatformBinaryMessenger extends BinaryMessenger {
+  final Map<String, _MessageHandler> _handlers = <String, _MessageHandler>{};
+
+  /// Receives a platform message from the framework.
+  @override
+  Future<void> handlePlatformMessage(String channel, ByteData data,
+      ui.PlatformMessageResponseCallback callback) async {
+    ByteData response;
+    try {
+      final MessageHandler handler = _handlers[channel];
+      if (handler != null) {
+        response = await handler(data);
+      }
+    } catch (exception, stack) {
+      FlutterError.reportError(FlutterErrorDetails(
+        exception: exception,
+        stack: stack,
+        library: 'flutter web shell',
+        context: ErrorDescription('during a plugin platform message call'),
+      ));
+    } finally {
+      callback(response);
+    }
+  }
+
+  /// Sends a platform message from the platform side back to the framework.
+  @override
+  Future<ByteData> send(String channel, ByteData message) {
+    throw FlutterError(
+        'Cannot send messages from the platform side to the framework.');
+  }
+
+  @override
+  void setMessageHandler(
+      String channel, Future<ByteData> Function(ByteData message) handler) {
+    if (handler == null)
+      _handlers.remove(channel);
+    else
+      _handlers[channel] = handler;
+  }
+
+  @override
+  void setMockMessageHandler(
+      String channel, Future<ByteData> Function(ByteData message) handler) {
+    throw FlutterError(
+        'Setting mock handlers is not supported on the platform side.');
+  }
+}
+
+/// The default [BinaryMessenger] for Flutter Web plugins.
+final BinaryMessenger pluginBinaryMessenger = _PlatformBinaryMessenger();

packages/flutter_web_plugins/pubspec.yaml

@@ -0,0 +1,43 @@
+name: flutter_web_plugins
+description: Library to register Flutter Web plugins
+author: Flutter Authors <flutter-dev@googlegroups.com>
+homepage: http://flutter.dev
+
+environment:
+  sdk: ">=2.0.0-dev.28.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  meta: 1.1.7 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  typed_data: 1.1.6 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  vector_math: 2.0.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  archive: 2.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  args: 1.5.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  async: 2.3.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  boolean_selector: 1.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  charcode: 1.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  image: 2.1.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  matcher: 0.12.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  path: 1.6.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  pedantic: 1.8.0+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  petitparser: 2.4.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  quiver: 2.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  source_span: 1.5.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  stack_trace: 1.9.3 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  stream_channel: 2.0.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  string_scanner: 1.0.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  term_glyph: 1.1.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  test_api: 0.2.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  xml: 3.5.0 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+
+# PUBSPEC CHECKSUM: 5c57

packages/flutter_web_plugins/test/plugin_registry_test.dart

@@ -0,0 +1,61 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+@TestOn('chrome') // Uses web-only Flutter SDK
+
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+
+class TestPlugin {
+  static void registerWith(Registrar registrar) {
+    final MethodChannel channel = MethodChannel(
+      'test_plugin',
+      const StandardMethodCodec(),
+      registrar.messenger,
+    );
+    final TestPlugin testPlugin = TestPlugin();
+    channel.setMethodCallHandler(testPlugin.handleMethodCall);
+  }
+
+  static final List<String> calledMethods = <String>[];
+
+  Future<void> handleMethodCall(MethodCall call) async {
+    calledMethods.add(call.method);
+  }
+}
+
+void main() {
+  group('Plugin Registry', () {
+    setUp(() {
+      TestWidgetsFlutterBinding.ensureInitialized();
+      webPluginRegistry.registerMessageHandler();
+    });
+
+    test('Can register a plugin', () {
+      TestPlugin.calledMethods.clear();
+
+      final Registrar registrar = webPluginRegistry.registrarFor(TestPlugin);
+      TestPlugin.registerWith(registrar);
+
+      const MethodChannel frameworkChannel =
+          MethodChannel('test_plugin', StandardMethodCodec());
+      frameworkChannel.invokeMethod<void>('test1');
+
+      expect(TestPlugin.calledMethods, <String>['test1']);
+    });
+
+    test('Throws when trying to send a platform message to the framework', () {
+      expect(() => pluginBinaryMessenger.send('test', ByteData(0)),
+          throwsFlutterError);
+    });
+
+    test('Throws when trying to set a mock handler', () {
+      expect(
+          () => pluginBinaryMessenger.setMockMessageHandler(
+              'test', (ByteData data) async => ByteData(0)),
+          throwsFlutterError);
+    });
+  });
+}

packages/fuchsia_remote_debug_protocol/pubspec.yaml

@@ -24,7 +24,7 @@ dependencies:
   collection: 1.14.11 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   convert: 2.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   crypto: 2.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
-  file: 5.0.8+1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
+  file: 5.0.10 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   image: 2.1.4 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   intl: 0.15.8 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   matcher: 0.12.5 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -49,4 +49,4 @@ dependencies:
 dev_dependencies:
   mockito: 4.1.0
 
-# PUBSPEC CHECKSUM: 70d0
+# PUBSPEC CHECKSUM: 8a9d