* Redesigns the algorithm with which MouseTracker keeps track of states and dispatches events. 

Fixes the android_semantics_testing integration test to have the right criteria now that ce150971 has landed.

git@github.com:flutter/engine.git/compare/5162413111b8...cef6751dba87

git log 5162413111b8..cef6751dba87 --no-merges --oneline
2019-10-10 chinmaygarde@gmail.com Revert "Test child isolates are terminated when root is shutdown (#13048)" (flutter/engine#13067)
2019-10-10 garyq@google.com Test child isolates are terminated when root is shutdown (flutter/engine#13048)
2019-10-10 chinmaygarde@google.com Allow embedders to specify arbitrary data to the isolate on launch. (flutter/engine#13047)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/c8f665c3a7b0...5162413111b8

git log c8f665c3a7b0..5162413111b8 --no-merges --oneline
2019-10-10 skia-flutter-autoroll@skia.org Roll src/third_party/skia 69537d798994..b484e7ce24c9 (8 commits) (flutter/engine#13065)
2019-10-10 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from xd5Jj... to 3GwxH... (flutter/engine#13064)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

This attempts to reland #40186 and #41220, that were reverted in #41945.

The main modifications from the original PRs are that I predefine the shortcuts and actions maps instead of defining them inline in the build function, and I use a new mapEquals to do a deep comparison so that we don't rebuild modified things if the contents of the map haven't changed.

I also eliminated an operator== and hashCode that were defined on the Actions widget, since widgets shouldn't have those. (it's too bad though: I get an 85% speedup if we leave this in! Too bad it prevents rebuilding of the children...)

Fixes #40101

* Adds a new parameter bool opaque to MouseRegion
* The same to RenderMouseRegion and AnnotatedRegionLayer
* Add findAnnotations to Layer 

Currently the surface of a platform view is only created only one when the state of PlatformViewLink is created. When the PlatformViewLink widget changes, the PlatformViewController in the corresponding state is also updated. Just the surface is not updated even though it depends on the controller.

This PR changes this behavior to recreate the surface whenever the controller is updated.

git@github.com:flutter/engine.git/compare/0b6aa5e3201a...c8f665c3a7b0

git log 0b6aa5e3201a..c8f665c3a7b0 --no-merges --oneline
2019-10-10 jason-simmons@users.noreply.github.com Allow embedders to disable causal async stacks in the Dart VM (flutter/engine#13004)
2019-10-10 jason-simmons@users.noreply.github.com Integration with more of Skia's SkShaper/SkParagraph APIs (flutter/engine#13008)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/a05803a0d2ba...0b6aa5e3201a

git log a05803a0d2ba..0b6aa5e3201a --no-merges --oneline
2019-10-10 yjbanov@google.com Add "felt clean" command (flutter/engine#13042)
2019-10-10 skia-flutter-autoroll@skia.org Roll src/third_party/skia 0fc9b3829b47..69537d798994 (1 commits) (flutter/engine#13061)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bytecode generation will otherwise omit prologue code, causing --causal-async-stacks passed to the VM to behave inconsistently.

Also updated the documentation for the ThemeData constructor to include
descriptions of parameters that don't map to specific fields directly.

1. The platform code to show the keyboard wasn't working on certain
devices. From my testing it appears to be related to when the code was
firing. IMM won't show the soft input (or shows and then immediately
hides it, it's hard to tell) if it's called before the Flutter UI is
loaded. Change this to instead show the soft keyboard after a message
from Flutter that main() has been started.

2. A text field was visible in the UI, and the test was run under a
fuzzer that random tapped portions of the screen. Remove the text field
so that the fuzzer can't accidentally open the keyboard on its own at a
random time.

3. The keyboard was left open even after the app was closed. Also toggle
the input off when the app was closed, so that this test can be ran
multiple times in succession relatively hermetically.

[BUG] Process all children of intent-filter instead of just the first one to identify default activity (#40029)

git@github.com:flutter/engine.git/compare/d25a623d7f90...a05803a0d2ba

git log d25a623d7f90..a05803a0d2ba --no-merges --oneline
2019-10-10 dnfield@google.com Android targets create final zip artifacts (flutter/engine#13059)
2019-10-10 sjindel@google.com Remove use of the blobs snapshot format from unittests (flutter/engine#12563)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

d25a623d7 Roll fuchsia/sdk/core/linux-amd64 from QIjex... to v8utw... (flutter/engine#13060) (#42425)


git@github.com:flutter/engine.git/compare/5a8605444187...d25a623d7f90

git log 5a8605444187..d25a623d7f90 --no-merges --oneline
2019-10-10 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from QIjex... to v8utw... (flutter/engine#13060)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Shard web tests; enable semantics tests on the Web

5a8605444 Roll src/third_party/skia fe23b1de9ed0..0fc9b3829b47 (1 commits) (flutter/engine#13058) (#42412)


git@github.com:flutter/engine.git/compare/f237896bac7c...5a8605444187

git log f237896bac7c..5a8605444187 --no-merges --oneline
2019-10-10 skia-flutter-autoroll@skia.org Roll src/third_party/skia fe23b1de9ed0..0fc9b3829b47 (1 commits) (flutter/engine#13058)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/ed1557f82dd4...f237896bac7c

git log ed1557f82dd4..f237896bac7c --no-merges --oneline
2019-10-10 bkonyi@google.com Roll src/third_party/dart cc3e22f724..48e93d3d3b (8 commits)
2019-10-10 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from pczjK... to xd5Jj... (flutter/engine#13055)
2019-10-10 dnfield@google.com Minimal test harness for iOS (flutter/engine#13029)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

* Capture stdout in test helper

* Simplify running getPackages() in test utils

* Remove unused import

git@github.com:flutter/engine.git/compare/179fab9dcbac...ed1557f82dd4

git log 179fab9dcbac..ed1557f82dd4 --no-merges --oneline
2019-10-10 chinmaygarde@google.com Don’t bump iOS deployment target for Metal builds. (flutter/engine#13051)
2019-10-10 duanweiwei1982@gmail.com Add texture support for macOS shell. (flutter/engine#8507)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/46b2e3d9a313...179fab9dcbac

git log 46b2e3d9a313..179fab9dcbac --no-merges --oneline
2019-10-10 chinmaygarde@google.com Set the Cirrus badge to only display status of the master branch. (flutter/engine#13053)
2019-10-10 bkonyi@google.com Roll src/third_party/dart 2ffdc54d24..cc3e22f724 (6 commits)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

* Add smoke test for the new Android embedding

* Update AndroidManifest.xml in app template

* Update test README.md

* Remove widget_test.dart

* Update pubspec.yaml

* Force GeneratedPluginRegistrant.java

git@github.com:flutter/engine.git/compare/eb7abf28e439...46b2e3d9a313

git log eb7abf28e439..46b2e3d9a313 --no-merges --oneline
2019-10-10 skia-flutter-autoroll@skia.org Roll src/third_party/skia 76826fc91c0a..fe23b1de9ed0 (4 commits) (flutter/engine#13050)
2019-10-10 chinmaygarde@google.com Ignore thread leaks from Dart VM in tsan instrumented builds. (flutter/engine#13049)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

git@github.com:flutter/engine.git/compare/e69319216729...eb7abf28e439

git log e69319216729..eb7abf28e439 --no-merges --oneline
2019-10-09 bkonyi@google.com Roll src/third_party/dart 41d13f0ffe..2ffdc54d24 (10 commits)
2019-10-09 ferhat@gmail.com [web] Implement basic radial gradient (TileMode.clamp, no transform) (flutter/engine#12811)
2019-10-09 dnfield@google.com dart analysis of tests, cleanup (flutter/engine#13033)
2019-10-09 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from cknsi... to QIjex... (flutter/engine#13041)
2019-10-09 skia-flutter-autoroll@skia.org Roll src/third_party/skia e27a503a0a21..76826fc91c0a (9 commits) (flutter/engine#13040)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

* Make sendMouseNotifications private

* Fix DropdownButton crash when hint and selectedItemBuilder are simultaneously defined

git@github.com:flutter/engine.git/compare/0d749933bcc6...e69319216729

git log 0d749933bcc6..e69319216729 --no-merges --oneline
2019-10-09 hterkelsen@users.noreply.github.com [web_ui] Check if a pointer is already down for the specific device (flutter/engine#12470)
2019-10-09 bkonyi@google.com Roll src/third_party/dart bb04f145b2..41d13f0ffe (24 commits)
2019-10-09 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from u0JpE... to pczjK... (flutter/engine#13025)
2019-10-09 gspencergoog@users.noreply.github.com Add missing focusable testing info (flutter/engine#13013)
2019-10-09 skia-flutter-autoroll@skia.org Roll src/third_party/skia 54548626a977..e27a503a0a21 (1 commits) (flutter/engine#13024)
2019-10-09 30870216+gaaclarke@users.noreply.github.com Refactor: FlutterDartProject (flutter/engine#13006)
2019-10-09 skia-flutter-autoroll@skia.org Roll src/third_party/skia 77dde599c98a..54548626a977 (1 commits) (flutter/engine#13023)
2019-10-09 skia-flutter-autoroll@skia.org Roll src/third_party/skia 2b1a25a4d324..77dde599c98a (1 commits) (flutter/engine#13021)
2019-10-09 bkonyi@google.com Roll src/third_party/dart f4a72bfc64..bb04f145b2 (18 commits)
2019-10-09 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from q_uYX... to cknsi... (flutter/engine#13019)
2019-10-09 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from wuAtw... to u0JpE... (flutter/engine#13018)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC chinmaygarde@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

* No longer rebuild Routes when MediaQuery updates

fixes #37878

* Fix tests

* PR feedback

* Add missing endline