* Fix DropdownButton disabledHint behavior

* Fix hint behavior when selectedItemBuilder is null

* Improve variable names, some formatting updates

* Create _DropdownMenuItemContainer widget

* Improve API docs to be consistent with hint/disabledHint actual behavior

Use assertions to prevent multiline password fields from being created

This re-lands the change that adds focus nodes, hover, and shortcuts to switches, checkboxes, and radio buttons. (#43213)

No changes from original, except for finding the right RenderBox in dev/integration_tests/android_semantics_testing/test_driver/main_test.dart.

git@github.com:flutter/engine.git/compare/6c257df8e7b9...869b74eb4eca

git log 6c257df8e7b9..869b74eb4eca --no-merges --oneline
2019-10-28 bkonyi@google.com Roll src/third_party/dart 207082714c..5b7c981086 (2 commits)
2019-10-28 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from eUAUP... to urhvj... (flutter/engine#13385)
2019-10-28 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from x1rDE... to 9MM-e... (flutter/engine#13383)
2019-10-28 skia-flutter-autoroll@skia.org Roll src/third_party/skia 01b1f63d641b..428b5de64a08 (1 commits) (flutter/engine#13382)
2019-10-28 bkonyi@google.com Roll src/third_party/dart d166b0be1c..207082714c (7 commits)
2019-10-28 skia-flutter-autoroll@skia.org Roll src/third_party/skia 62160f2f358a..01b1f63d641b (1 commits) (flutter/engine#13380)
2019-10-27 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 1SdS3... to eUAUP... (flutter/engine#13379)
2019-10-27 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from SbuUq... to x1rDE... (flutter/engine#13378)
2019-10-27 skia-flutter-autoroll@skia.org Roll src/third_party/skia ff82e15d014a..62160f2f358a (1 commits) (flutter/engine#13377)
2019-10-27 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from zvXL3... to 1SdS3... (flutter/engine#13376)
2019-10-27 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from qmqw-... to SbuUq... (flutter/engine#13375)
2019-10-26 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from eUB9h... to zvXL3... (flutter/engine#13373)
2019-10-26 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from oeFc8... to qmqw-... (flutter/engine#13372)
2019-10-26 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from fHxWy... to eUB9h... (flutter/engine#13371)
2019-10-26 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from Tbg2V... to oeFc8... (flutter/engine#13370)


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* [flutter_tool] Use engine flutter_runner prebuilts

* Update packages/flutter_tools/lib/src/fuchsia/fuchsia_build.dart
Co-Authored-By: Jonah Williams <jonahwilliams@google.com>

git@github.com:flutter/engine.git/compare/3ebf00690418...6c257df8e7b9

git log 3ebf00690418..6c257df8e7b9 --no-merges --oneline
2019-10-26 bkonyi@google.com Roll src/third_party/dart 6354b0b97d..d166b0be1c (4 commits)


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This reverts commit b49ffa81.

3ebf00690 Deprecated DartExecutor as BinaryMessenger and added a getBinaryMessenger() method. (#43202) (flutter/engine#13349) (#43562)


git@github.com:flutter/engine.git/compare/1c104d435994...3ebf00690418

git log 1c104d435994..3ebf00690418 --no-merges --oneline
2019-10-26 matthew-carroll@users.noreply.github.com Deprecated DartExecutor as BinaryMessenger and added a getBinaryMessenger() method. (#43202) (flutter/engine#13349)


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git@github.com:flutter/engine.git/compare/d41e33dbe447...1c104d435994

git log d41e33dbe447..1c104d435994 --no-merges --oneline
2019-10-26 bkonyi@google.com Roll src/third_party/dart 5e44c0b016..6354b0b97d (8 commits)


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git@github.com:flutter/engine.git/compare/f082b3223608...d41e33dbe447

git log f082b3223608..d41e33dbe447 --no-merges --oneline
2019-10-26 skia-flutter-autoroll@skia.org Roll fuchsia/clang/linux-amd64 from 2EAvs... to Vghc_... (flutter/engine#13366)
2019-10-26 skia-flutter-autoroll@skia.org Roll fuchsia/clang/mac-amd64 from xTJWs... to EpbPE... (flutter/engine#13365)


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git@github.com:flutter/engine.git/compare/89731aefca5b...f082b3223608

git log 89731aefca5b..f082b3223608 --no-merges --oneline
2019-10-25 iska.kaushik@gmail.com [flutter_runner] Remove the checks for libdart profiler symbols (flutter/engine#13364)
2019-10-25 bkonyi@google.com Roll src/third_party/dart 5ba6fb73ec..5e44c0b016 (11 commits)
2019-10-25 skia-flutter-autoroll@skia.org Roll src/third_party/skia d0a404e84d47..ff82e15d014a (5 commits) (flutter/engine#13362)
2019-10-25 hterkelsen@users.noreply.github.com Expand on CanvasKit backend more (flutter/engine#13361)
2019-10-25 yjbanov@google.com Web: fix Color subclass handling (flutter/engine#13359)


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This reverts commit 8e8d235d.

git@github.com:flutter/engine.git/compare/7a9c86b8d5e9...89731aefca5b

git log 7a9c86b8d5e9..89731aefca5b --no-merges --oneline
2019-10-25 ditman@gmail.com Intercept SystemSound.play platform message before it's sent. (flutter/engine#13342)
2019-10-25 iska.kaushik@gmail.com [fuchsia] [packaging] Layout debug symbols for Fuchsia (flutter/engine#13338)
2019-10-25 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from Dr9GE... to fHxWy... (flutter/engine#13358)
2019-10-25 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from KC8wX... to Tbg2V... (flutter/engine#13357)
2019-10-25 ariaye@google.com Bump dart/language_model to 9fJQZ0TrnAGQKrEtuL3-AXbUfPzYxqpN_OBHr9P4hE4C (flutter/engine#13337)
2019-10-25 skia-flutter-autoroll@skia.org Roll src/third_party/skia a7f3157ac012..d0a404e84d47 (6 commits) (flutter/engine#13356)
2019-10-25 bkonyi@google.com Roll src/third_party/dart d576ce69e1..5ba6fb73ec (3 commits)
2019-10-25 jason-simmons@users.noreply.github.com Create a separate directory for the intermediate outputs of each Fuchsia archive build action (flutter/engine#13341)
2019-10-25 jason-simmons@users.noreply.github.com Fix the output filename of the Fuchsia archive build template (flutter/engine#13339)
2019-10-25 bkonyi@google.com Roll src/third_party/dart b42c2af535..d576ce69e1 (10 commits)
2019-10-25 skia-flutter-autoroll@skia.org Roll src/third_party/skia 24a409611f24..a7f3157ac012 (1 commits) (flutter/engine#13353)
2019-10-25 skia-flutter-autoroll@skia.org Roll src/third_party/skia 28a8f28b3eaf..24a409611f24 (2 commits) (flutter/engine#13352)
2019-10-25 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from 9m5ec... to Dr9GE... (flutter/engine#13351)
2019-10-25 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from yuA3r... to KC8wX... (flutter/engine#13350)
2019-10-25 skia-flutter-autoroll@skia.org Roll src/third_party/skia 6f1c20f01fa9..28a8f28b3eaf (2 commits) (flutter/engine#13348)
2019-10-25 chris@bracken.jp Expose platform view ID on embedder semantics node (flutter/engine#13345)
2019-10-25 chris@bracken.jp Remove TODO on embedder a11y unit tests (flutter/engine#13346)
2019-10-25 bkonyi@google.com Roll src/third_party/dart 1bc9fba660..b42c2af535 (12 commits)
2019-10-25 matthew-carroll@users.noreply.github.com Android embedding API updates for plugin ecosystem - plugin facade, split Lifecycle, save state callbacks to plugins (#43241, #43242, #43295) (flutter/engine#13280)
2019-10-24 skia-flutter-autoroll@skia.org Roll src/third_party/skia 740f85949db2..6f1c20f01fa9 (16 commits) (flutter/engine#13343)
2019-10-24 bkonyi@google.com Roll src/third_party/dart 1bd6e20d76..1bc9fba660 (14 commits)
2019-10-24 skia-flutter-autoroll@skia.org Roll src/third_party/skia 4ab4e641f151..740f85949db2 (12 commits) (flutter/engine#13336)


If this roll has caused a breakage, revert this CL and stop the roller
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This will prevent the test from flaking based on updates to either
package.

* enable more tests after material fixes
* enable some of the Cupertino tests

* initial bootstrap script for incremental compiler support

* add more comments

* update to two scripts

* Don't html-escape in the plugin registrant templates.

Fixes #43382

* Add test

git@github.com:flutter/engine.git/compare/8d6b74aee6fb...7a9c86b8d5e9

git log 8d6b74aee6fb..7a9c86b8d5e9 --no-merges --oneline
2019-10-24 iska.kaushik@gmail.com [fuchsia] [packaging] undle host binaries per runtime_mode (flutter/engine#13335)
2019-10-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from hlL2H... to 9m5ec... (flutter/engine#13334)


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git@github.com:flutter/engine.git/compare/384a0b8d729c...8d6b74aee6fb

git log 384a0b8d729c..8d6b74aee6fb --no-merges --oneline
2019-10-24 bkonyi@google.com Roll src/third_party/dart 081c01e89a..1bd6e20d76 (6 commits)
2019-10-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from bad9W... to yuA3r... (flutter/engine#13332)


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384a0b8d7 Roll src/third_party/skia 3d8b9b834731..4ab4e641f151 (1 commits) (flutter/engine#13331) (#43434)


git@github.com:flutter/engine.git/compare/2abf1101b482...384a0b8d729c

git log 2abf1101b482..384a0b8d729c --no-merges --oneline
2019-10-24 skia-flutter-autoroll@skia.org Roll src/third_party/skia 3d8b9b834731..4ab4e641f151 (1 commits) (flutter/engine#13331)


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This reverts commit 4f385c8f.

* Add repeatCount to RawKeyEventDataAndroid

Adds a new field to RawKeyEventDataAndroid and sets it to the value
passed from the engine. It is the value returned by
KeyEvent.getRepeatCount(). This allows us to differentiate between
events generated by a new keypress and repeated events when a key is
held down.

* Add test for RawKeyEventDataAndroid.repeatCount

* Set default borderRadius to none in ClipRRect

* add tests