Heavy Widget construction and destruction performance test (#60336)

* Add widget construction benchmark

* Add to device lab

dev/benchmarks/macrobenchmarks/lib/common.dart

@@ -14,5 +14,6 @@ const String kAnimatedPlaceholderRouteName = '/animated_placeholder';
 const String kColorFilterAndFadeRouteName = '/color_filter_and_fade';
 const String kFadingChildAnimationRouteName = '/fading_child_animation';
 const String kImageFilteredTransformAnimationRouteName = '/imagefiltered_transform_animation';
+const String kMultiWidgetConstructionRouteName = '/multi_widget_construction';
 
 const String kScrollableName = '/macrobenchmark_listview';

dev/benchmarks/macrobenchmarks/lib/main.dart

@@ -13,6 +13,7 @@ import 'src/backdrop_filter.dart';
 import 'src/cubic_bezier.dart';
 import 'src/cull_opacity.dart';
 import 'src/filtered_child_animation.dart';
+import 'src/multi_widget_construction.dart';
 import 'src/post_backdrop_filter.dart';
 import 'src/simple_animation.dart';
 import 'src/text.dart';
@@ -43,6 +44,7 @@ class MacrobenchmarksApp extends StatelessWidget {
         kColorFilterAndFadeRouteName: (BuildContext context) => ColorFilterAndFadePage(),
         kFadingChildAnimationRouteName: (BuildContext context) => const FilteredChildAnimationPage(FilterType.opacity),
         kImageFilteredTransformAnimationRouteName: (BuildContext context) => const FilteredChildAnimationPage(FilterType.rotateFilter),
+        kMultiWidgetConstructionRouteName: (BuildContext context) => const MultiWidgetConstructTable(10, 20),
       },
     );
   }
@@ -136,10 +138,10 @@ class HomePage extends StatelessWidget {
             },
           ),
           RaisedButton(
-            key: const Key(kImageFilteredTransformAnimationRouteName),
-            child: const Text('ImageFiltered Transform Animation'),
+            key: const Key(kMultiWidgetConstructionRouteName),
+            child: const Text('Widget Construction and Destruction'),
             onPressed: () {
-              Navigator.pushNamed(context, kImageFilteredTransformAnimationRouteName);
+              Navigator.pushNamed(context, kMultiWidgetConstructionRouteName);
             },
           ),
         ],

dev/benchmarks/macrobenchmarks/lib/src/multi_widget_construction.dart

@@ -0,0 +1,123 @@
+// Copyright 2014 The Flutter 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 'package:flutter/material.dart';
+
+class MultiWidgetConstructTable extends StatefulWidget {
+  const MultiWidgetConstructTable(this.column, this.row, {Key key})
+      : super(key: key);
+
+  final int column;
+  final int row;
+
+  @override
+  _MultiWidgetConstructTableState createState() =>
+      _MultiWidgetConstructTableState();
+}
+
+class _MultiWidgetConstructTableState extends State<MultiWidgetConstructTable>
+    with SingleTickerProviderStateMixin {
+  static const List<MaterialColor> colorList = <MaterialColor>[
+    Colors.pink, Colors.red, Colors.deepOrange, Colors.orange, Colors.amber,
+    Colors.yellow, Colors.lime, Colors.lightGreen, Colors.green, Colors.teal,
+    Colors.cyan, Colors.lightBlue, Colors.blue, Colors.indigo, Colors.purple,
+  ];
+  int counter = 0;
+  Color baseColor = colorList[0][900];
+
+  AnimationController controller;
+  CurvedAnimation curve;
+
+  @override
+  void initState() {
+    super.initState();
+    controller = AnimationController(
+        vsync: this, duration: const Duration(milliseconds: 10000));
+    curve = CurvedAnimation(parent: controller, curve: Curves.linear)
+      ..addListener(() {
+        final double colorPosition = curve.value;
+        final int c1Position = (colorPosition * (colorList.length + 1)).floor();
+        final Color c1 = colorList[c1Position % colorList.length][900];
+        final Color c2 = colorList[(c1Position + 1) % colorList.length][900];
+        setState(() {
+          baseColor = Color.lerp(
+              c1, c2, colorPosition * (colorList.length + 1) - c1Position);
+        });
+      })
+      ..addStatusListener((AnimationStatus state) {
+        if (state == AnimationStatus.completed) {
+          controller.reverse();
+        } else if (state == AnimationStatus.dismissed) {
+          controller.reset();
+          controller.forward();
+        }
+      });
+
+    controller.forward();
+  }
+
+  @override
+  void dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final int totalLength = widget.row * widget.column;
+    final int widgetCounter = counter * totalLength;
+    final double height = MediaQuery.of(context).size.height / widget.column;
+    counter++;
+    return Scaffold(
+      body: Table(
+        children: List<TableRow>.generate(
+          widget.row,
+          (int row) => TableRow(
+            children: List<Widget>.generate(
+              widget.column,
+              (int column) {
+                final int label = row * widget.column + column;
+                return counter % 2 == 0
+                    ? Container(
+                        // This key forces rebuilding the element
+                        key: ValueKey<int>(widgetCounter + label),
+                        color: Color.lerp(
+                            Colors.white, baseColor, label / totalLength),
+                        child: Text('${widgetCounter + label}'),
+                        constraints: BoxConstraints.expand(height: height),
+                      )
+                    : MyContainer(
+                        // This key forces rebuilding the element
+                        key: ValueKey<int>(widgetCounter + label),
+                        color: Color.lerp(
+                            Colors.white, baseColor, label / totalLength),
+                        child: Text('${widgetCounter + label}'),
+                        constraints: BoxConstraints.expand(height: height),
+                      );
+              },
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+// This class is intended to break the original Widget tree
+class MyContainer extends StatelessWidget {
+  const MyContainer({this.color, this.child, this.constraints, Key key})
+      : super(key: key);
+  final Color color;
+  final Widget child;
+  final BoxConstraints constraints;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      color: color,
+      child: child,
+      constraints: constraints,
+    );
+  }
+}

dev/benchmarks/macrobenchmarks/test_driver/multi_widget_construction_perf.dart

@@ -0,0 +1,11 @@
+// Copyright 2014 The Flutter 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 'package:flutter_driver/driver_extension.dart';
+import 'package:macrobenchmarks/main.dart' as app;
+
+void main() {
+  enableFlutterDriverExtension();
+  app.main();
+}

dev/benchmarks/macrobenchmarks/test_driver/multi_widget_construction_perf_test.dart

@@ -0,0 +1,17 @@
+// Copyright 2014 The Flutter 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 'package:macrobenchmarks/common.dart';
+
+import 'util.dart';
+
+void main() {
+  macroPerfTest(
+    'multi_widget_construction_perf',
+    kMultiWidgetConstructionRouteName,
+    pageDelay: const Duration(seconds: 1),
+    duration: const Duration(seconds: 10),
+    timeout: const Duration(seconds: 45),
+  );
+}

dev/devicelab/bin/tasks/multi_widget_construction_perf__timeline_summary.dart

@@ -0,0 +1,14 @@
+// Copyright 2014 The Flutter 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 'package:flutter_devicelab/tasks/perf_tests.dart';
+import 'package:flutter_devicelab/framework/adb.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.android;
+  await task(createsMultiWidgetConstructPerfTest());
+}

dev/devicelab/lib/tasks/perf_tests.dart

@@ -242,6 +242,14 @@ TaskFunction createImageFilteredTransformAnimationPerfTest() {
   ).run;
 }
 
+TaskFunction createsMultiWidgetConstructPerfTest() {
+  return PerfTest(
+    '${flutterDirectory.path}/dev/benchmarks/macrobenchmarks',
+    'test_driver/multi_widget_construction_perf.dart',
+    'multi_widget_construction_perf',
+  ).run;
+}
+
 /// Measure application startup performance.
 class StartupTest {
   const StartupTest(this.testDirectory, { this.reportMetrics = true });

dev/devicelab/manifest.yaml

@@ -156,6 +156,12 @@ tasks:
     stage: devicelab
     required_agent_capabilities: ["mac/android"]
 
+  multi_widget_construction_perf__timeline_summary:
+    description: >
+      Measures the runtime performance of constructing and destructing widgets on Android.
+    stage: devicelab
+    required_agent_capabilities: ["linux/android"]
+
   picture_cache_perf__timeline_summary:
     description: >
       Measures the runtime performance of raster caching many pictures on Android.