Changes since last roll:
```
ed303c628 Roll dart sdk again. Previous roll required 23ae4fa098 revert. (#4966)
8cd272733 Revert "Roll dart to 7764e6962e22afcf4b58c4e3cef3147330f3c884. (#4960)" (#4965)
9199b40f2 Revert "Support multiple shells in a single process. (#4932)" (#4964)
6baff4c82 Support multiple shells in a single process. (#4932)
31c5bb427 Roll dart to 7764e6962e22afcf4b58c4e3cef3147330f3c884. (#4960)
c8e4c6984 Avoid copying the contents of large platform message responses (#4947)
5ff527295 Update to use new vulkan GrBackendRenderTarget ctor. (#4962)
0c8993a1a Update to use new vulkan GrBackendRenderTarget ctor (part 2) (#4963)
132ebdda8 Revert "Roll src/third_party/skia/ 9874bf1bc..52e16d984 (135 commits) (#4958)" (#4961)
11882ab9e Roll src/third_party/skia/ 9874bf1bc..52e16d984 (135 commits) (#4958)
```
Add consts
* Revert "Roll engine to 6473f1b106485cb0b4ea569af383173daeef8895 (#16032)"
This reverts commit 844ced010a.
* Revert "Let travis test archiving per commit too (#16004)"
This reverts commit df5905f382.
Adds a package that will support connecting to and debugging devices with multiple instances of the Dart VM, and operate on multiple Isolates and Flutter Views.
Currently supports connecting to all existing Dart VMs and extracting information about all Flutter Views running across each VM.
This is not a grand refactor yet, it's just cleaning up what we have
already, so that people who keep using this API (e.g. dialogs) have
something coherent to deal with.
The major changes are that Navigator and NavigatorState have the same
API now, that most of the examples use `<void>` instead of `<Null>`,
that the navigator observer can see replaces, and that the `settings`
is moved from ModalRoute to Route. I also cleaned up some of the API
documentation.
* use HttpOverrides and dart:io HttpClient in flutter
* add missing package:http dependency
* update flutter packages and remove comment about createHttpClient from flutter_test
* move byte loading logic to common class, move string parsing logic to base class
* addAll doesn't work for a Uint8List
* use bytes.setRange
* undo addition to hello_world
* add newline to end of binding.dart
* and a newline for hello world
* refactor to function and add tests
* address comments on unknown length case
* alignment
* sort alaphabetically
* rename convertResponse to consolidateClientHttpClientResponseBytes. Add header
* fix alignment in test
* Gallery scaffolding
* Started RenderSliver
* demo and initial hookup
* Cleaned up demo more and scaffolding basic sliver->widget communication structure.
* works
* states and default indicator building works
* start adding docs
* added an alignment setting optimized the sliver relayout mechanism
* tested a default bottom aligned sized indicator
* Added a bunch of tests
* more fixes and more tests
* Finished the tests
* Add docs
* Add more doc diffing wrt material pull to refresh
* Mention nav bar synergy
* add more asserts
* review 1
* Fix mockito 2 / dart 2 / strong typed tests
* review
* Remove the vscode config
* review
* traverse dependencies and dev dependencies separately
* separate dev and reg deps
* update pubspecs
* add checksum string and update transitive dep string. Add additional verify command to check checksum
* cleanup comments
* add missing space, quote, run verify-onlu from bot script
* rerun tool with fixed string
* ensure correct working directory and bump versions
* flutter not flutterRoot
This adds a slider demo with a custom theme to the gallery.
In the process of adding this, I decided to add a text theme to the SliderThemeData, since it's a pain to change the text style on the value indicator otherwise.
* Add support to move the fab between positions.
* Motion demo for the FAB works between center and end floating.
* Add a Material curve to the offset animation.
* Move the fab position into an object
* Updates to docs
* Updates to docs
* Fix a lint on the bottom sheet type
* Add a ScaffoldGeometry class
* Improve the documentation
* Improve the documentation
* Add a fab motion animator
* Add position and scale animations
* FAB entrance and motion animations work
* Get started on FAB motion
* Make fab animation work properly.
* Change the fab animator to be stored in the state of the scaffold.
* Add a layout test
* Fix spacing being off
* Fix the entrance/exit animation test.
* Add a textDirection to the layout delegate.
* Fix const constructor lint checks
* Add toStrings for the fab positioner/animator
* Add a toString for CurveTween
* Change the fab motion demo icon to a simple add icon.
* Add tests and a custom fab positioner to the demo.
* Do not start the fab's motion animation when the fab is null.
* Adjust the code to pass the new tests.
* Rename for in response to Hans' comment.
* Revert the tabs fab demo
* Use timeDilation, and clean up the animation code a little.
* Clean up the prelayout geometry docs and ctr order
* Cleanup fab transition widget code
* Clean up comments on Scaffold, add cross-references between the two geometries
* Explain the fab motion animation scheduling better
* Add a const to the fab motion demo
* Make the fab animation never jank by keeping track of where to move the fab to in the future.
* Add a default fab positioner constant
* Add space after comma in the demo
* Add boilerplate dartdoc to all const constructors
* Comment improvement
* Rename 'fabSize' to 'floatingActionButtonSize'
* Rename 'fabSize' to 'floatingActionButtonSize'
* Rename 'fabSize' to 'floatingActionButtonSize'
* Clean up the prelayout geometry object's dartdoc
* Clean up the prelayout geometry object's dartdoc
* Remove extraneous comment
* Change possessive uses of Scaffold's to use dartdoc-compatible [Scaffold]'s
* Rename the horizontalFabPadding to an expansion
* Clean up controller cleanup and setState usage
* Animate instead of lerp
* Make the fab position animation use offsets instead of animations
* Streamline the fab motion demo
* Set up the animator to start from a reasonable place when interrupting animations.
* Doc cleanup on the new animation interruption
* Expand some uses of fab and clean up constants
* Expand remaining public uses of fab to floating action button
* Expand remaining public uses of fab to floating action button
* Expand on the documentation for the fab positioner and animator
* Refactor animations to broadcast the position properly.
* Add the ability to turn on and off the fab to the motion demo.
* Remove unused code
* Change the fab animator to animate even when the fab is exitting.
* Remove extra positioner.
* Apps -> Applications in docs
* Explain the scale animation.
* Name the child parameter in the animated builder
* RTL before LTR
* Wrap the AppBar in the example code
* const the fab motion demo name
* Start a test against animation jumps
* Test for jumps in the fab motion animation
* Dont initialize values to null
* Use constants, fix spacing from some of Hans' comments
* Clarify the relationship between fab positioners and prelayout geometries
* Explain the fab animmator a bit better
* Explain the animation progress in the fab animation
* Explain the animation restart better
* Explain the animation restart better
* Explain the prelayout geometry better
* Explain that height is a vertical distance.
* Explain the horizontal fab padding
* Update the scaffold size description to explain what happens when a wild keyboard appears
* Remove print statements
* Update the scaffold geometry with information about it being available at paint time.
* In one step of a transition
* Explain how the top-start fab positioner works
* Explain how the top-start fab positioner works
* Refactor the scaffold layout to just pass a padding instead of a bottom, top, start and end.
* Refactor the scaffold layout to just pass a padding instead of a bottom, top, start and end.
* Action buttons with with custom positioners.
* Add a rotation animation example.
* Use a swap animation to show swapping between two different animations.
* Use a swap animation to show swapping between two different animations.
* Add an example for the size animations.
* 2018 copyright
* Extra empty line
* Return new Scaffold
* Extra blank line fix
* All its contents have been laid out
* Position the fab
* Explain what the scaffold geometry is for.
* Move asserts to different lines
* The scaffoldsize will not
* Initial rename of FabPositioners to FloatingActionButtonLocation
* Rename comments in example to refer to location instead of positioner.
* Rename fabpositioner to location in tests and in the scaffold field
* Finish removing references to positioner in scaffold code.
* Split the fab location and animation out into a separate file.
* Make things more private
* Import foundation instead of meta
* Const curve instead of final.
* replace child parameter with builder on showDialog
* change builder parameter to WidgetBuilder
* mark child as deprecated and expand documentation to cover this and how builder should be used
* tidy comments and address some feedback
* phrasing
* move space to prev line and add //ignore comments for deprecated member use
* address comments and fix it's its
* update code samples
* adds semicolon to code snippets
