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)


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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
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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)


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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)


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* 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)


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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)


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* 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
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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)


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To report a problem with the AutoRoller itself, please file a bug:
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* 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
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is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
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Documentation for the AutoRoller is here:
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* No longer rebuild Routes when MediaQuery updates

fixes #37878

* Fix tests

* PR feedback

* Add missing endline

* Reprise: Dropdown Menu layout respects menu items intrinsic sizes

* updated per review feedback

* updated per review feedback

This updated the broken android_semantics_test to correspond to existing engine behavior.

This adds a Semantics node to the Focus and FocusScope widgets, setting the focused and focusable attributes so that the accessibility subsystem can be told when a control has the input focus.

Includes an engine roll to flutter/engine@77252d2, and the following 8 engine changes:

flutter/engine@77252d2 Greg Spencer Add missing focusable testing info (flutter/engine#13013)
flutter/engine@0e42a29 skia-flutter-.. Roll src/third_party/skia 54548626a977..e27a503a0a21 (1 commits) (flutter/engine#13024)
flutter/engine@6b56ed7 gaaclarke Refactor: FlutterDartProject (flutter/engine#13006)
flutter/engine@393480c skia-flutter-.. Roll src/third_party/skia 77dde599c98a..54548626a977 (1 commits) (flutter/engine#13023)
flutter/engine@080b89d skia-flutter-.. Roll src/third_party/skia 2b1a25a4d324..77dde599c98a (1 commits) (flutter/engine#13021)
flutter/engine@90b0f30 Ben Konyi Roll src/third_party/dart f4a72bfc64..bb04f145b2 (18 commits) (flutter/engine#13020)
flutter/engine@049fb89 skia-flutter-.. Roll fuchsia/sdk/core/linux-amd64 from q_uYX... to cknsi... (flutter/engine#13019)
flutter/engine@6925b2a skia-flutter-.. Roll fuchsia/sdk/core/mac-amd64 from wuAtw... to u0JpE... (flutter/engine#13018)

Related Issues
Addresses #40101

Landing on red in order to fix the build: it's red because of the needed engine roll.

Fix regression with ModalBottomSheets not responding to changes in theme
after they are shown.

0d749933b Roll src/third_party/skia 1494a7f1ec03..2b1a25a4d324 (15 commits) (flutter/engine#13016) (#42290)


git@github.com:flutter/engine.git/compare/1e58794b238b...0d749933bcc6

git log 1e58794b238b..0d749933bcc6 --no-merges --oneline
2019-10-09 skia-flutter-autoroll@skia.org Roll src/third_party/skia 1494a7f1ec03..2b1a25a4d324 (15 commits) (flutter/engine#13016)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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To report a problem with the AutoRoller itself, please file a bug:
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Documentation for the AutoRoller is here:
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Ensure web restart analytics events aren't sent for failures/dont serve devtools by default  (#42260)

git@github.com:flutter/engine.git/compare/21b8224ae12d...1e58794b238b

git log 21b8224ae12d..1e58794b238b --no-merges --oneline
2019-10-09 chinmaygarde@gmail.com Revert "Upgrade compiler to Clang 10. (#11256)" (flutter/engine#13017)
2019-10-09 chinmaygarde@google.com Upgrade compiler to Clang 10. (flutter/engine#11256)


If this roll has caused a breakage, revert this CL and stop the roller
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git@github.com:flutter/engine.git/compare/c635d70c7266...21b8224ae12d

git log c635d70c7266..21b8224ae12d --no-merges --oneline
2019-10-08 gspencergoog@users.noreply.github.com Send AccessibilityEvent.TYPE_VIEW_FOCUSED when input focus is set. (flutter/engine#12746)
2019-10-08 dnfield@google.com Fix for a11y crash on iOS (flutter/engine#12990)
2019-10-08 katelovett@google.com Link Semantics Typo (flutter/engine#13009)
2019-10-08 ferhat@gmail.com [web] Add support for path transform (flutter/engine#12794)
2019-10-08 jason-simmons@users.noreply.github.com Auto-formatter fixes for BUILD.gn files (flutter/engine#13005)
2019-10-08 bkonyi@google.com Unblock SIGPROF on flutter_tester start (flutter/engine#12813)
2019-10-08 mouad.debbar@gmail.com [web] Update the url when route is replaced (flutter/engine#13003)
2019-10-08 katelovett@google.com Missing link flag (flutter/engine#13001)
2019-10-08 30870216+gaaclarke@users.noreply.github.com Started setting our debug background task id to invalid after completion. (flutter/engine#12999)
2019-10-08 ychris@google.com Add `onUnregistered` callback in 'Texture' and 'FlutterTexture' (flutter/engine#12695)


If this roll has caused a breakage, revert this CL and stop the roller
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