DevFS.update only runs in Dart 2 mode when the generator parameter is
supplied. In Dart 2 mode, both mainPath and pathToReload are required
parameters; this patch marks them as such.

generator is required for running in Dart 2. All call sites other than tests already explicitly set this value.

Note the statements on line 510 and line 516 for why mainPath and pathToReload are required.

Its type uses a generic type which is limited to library-visibility.
Eliminating compilationQueue from ResidentCompiler's public interface
makes it possible to mock in tests.

https://github.com/flutter/engine/compare/90faf8531c00...f612a761c2f0

git log 90faf8531c00..f612a761c2f0 --no-merges --oneline
f612a761c Roll src/third_party/skia 8ff2f13f3817..62db8d577931 (21 commits) (flutter/engine#6130)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/a114659c4a83...90faf8531c00

git log a114659c4a83..90faf8531c00 --no-merges --oneline
90faf8531 Roll src/third_party/skia f8592a69428e..8ff2f13f3817 (1 commits) (flutter/engine#6129)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/dc7b5eb89da3...a114659c4a83

git log dc7b5eb89da3..a114659c4a83 --no-merges --oneline
a114659c4 Roll src/third_party/skia 381efe73499e..f8592a69428e (1 commits) (flutter/engine#6127)
21ac961df Roll src/third_party/skia 8e318fda76df..381efe73499e (11 commits) (flutter/engine#6126)
e7767ae9b Add license file patching instructions to README (flutter/engine#6125)
51d4be774 Add a `-[FlutterViewController splashScreenView]` property (flutter/engine#6112)
a047fd20f Roll src/third_party/skia 7ed0eae0cd13..8e318fda76df (17 commits) (flutter/engine#6123)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

This fixes https://github.com/flutter/flutter/issues/20746

https://github.com/flutter/flutter/issues/19578

Flutter commands all default to --preview-dart-2. Eliminate support for
the use of this option and the previewDart2 parameter in dev/devicelab
tests.

Normalize file path to non-Windows so string path comparison works.

Clarify the intent of these tests.

https://github.com/flutter/engine/compare/252da4808277...dc7b5eb89da3

git log 252da4808277..dc7b5eb89da3 --no-merges --oneline
dc7b5eb89 Use Skia normalize again after Skia precision fix. (flutter/engine#6121)
1c7682418 entering a character with a selection deletes the selection (flutter/engine#6113)
9fc355d2c Roll src/third_party/skia cd7907b57d76..7ed0eae0cd13 (1 commits) (flutter/engine#6120)
6586016da Roll src/third_party/skia f7c723c93d26..cd7907b57d76 (1 commits) (flutter/engine#6119)
1fa5fe6a0 Roll src/third_party/skia eb0bb732f43f..f7c723c93d26 (3 commits) (flutter/engine#6118)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

* Pass uri instead of filepaths when hot-reloading.

Bug: https://github.com/flutter/flutter/issues/21168

* Remove imports. Enable another test

* Restore skipping of test on mac

This adds links to the already existing animated diagrams in the asset-for-api-docs repo.

* Split analysis steps out of dev/bots/test.dart into dev/bots/analyze.dart.

This allows to run analysis step with command line arguments that are only applicable to flutter analyze(like --dart-sdk, needed for dart-flutter-engine head-head-head bot).

* Add forgotten dev/bots/analyze.dart

* Refactor common code from analyze.dart and test.dart into run_command.dart

* Remove comments, add header

* [FAB] Updated tooltip touch target.

* Remove "new" keyword

* [FAB] Updated tooltip touch target.

* "long press button edge"

* remove new

* remove new

* put "new" keywords back in

* Remove check for childless tooltip

* Added regression test - tooltip works on edge of FAB which has no child.

Added helper method to find the right edge of a in the tests.

* Changed "find.byType(text)" to "find.text('Add')"

When switching between channels, we were leaving around the version freshness stamp file (bin/cache/flutter_version_check.stamp), which meant that the flutter tool would read from that file to see what the cached date of the most recent commit to the current channel (branch) was. The problem was that since the file was created while on the previous channel, the cached date was for the wrong channel, so if you switch from master to beta, flutter would think that the channel was out of date, and a new version was available, at least for three days after the first time it checked (after three days since the last time the freshness was checked, the cached date would get updated).

This PR modifies the channel command to remove that stamp file whenever the user switches channels, so that the cached date will be from the right channel when it is recreated.

Fixes #21134

https://github.com/flutter/engine/compare/a02a94e0182c...252da4808277

git log a02a94e0182c..252da4808277 --no-merges --oneline
252da4808 Roll src/third_party/skia 1b714becff8b..eb0bb732f43f (2 commits) (flutter/engine#6116)
cba35d33a Roll Tonic (flutter/engine#6114)
7a599658d Roll src/third_party/skia 1f0fb09d5e35..1b714becff8b (11 commits) (flutter/engine#6115)
4a6990734 Fix libtxt unit tests (flutter/engine#6111)
c765bee59 Fix tilt by using custom normalize impl to avoid strange skia normalize behavior (flutter/engine#6106)
9fde6e0d8 Roll src/third_party/skia a81c2be75adc..1f0fb09d5e35 (13 commits) (flutter/engine#6110)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

This is follow-up to https://github.com/flutter/flutter/pull/21143.

Workaround is not needed since real fix has landed in dart sdk: https://dart-review.googlesource.com/c/sdk/+/62729.

https://github.com/flutter/engine/compare/eceb722b7111...a02a94e0182c

git log eceb722b7111..a02a94e0182c --no-merges --oneline
a02a94e01 Roll src/third_party/skia 33f34556b5fc..a81c2be75adc (1 commits) (flutter/engine#6109)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/f3ff83a5db71...eceb722b7111

git log f3ff83a5db71..eceb722b7111 --no-merges --oneline
eceb722b7 Roll Dart to dart-lang/sdk@760a9690c2 (flutter/engine#6108)
be9d8ffbb Roll src/third_party/skia 5f0726b01019..33f34556b5fc (1 commits) (flutter/engine#6107)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

This is a bit of a stab in the dark for a flake sometimes seen on bots (but I can't repro locally) #20822. Detaching from a Flutter app currently seems to terminate it, so it may be the cause of the "app not found" when trying to stop the app subsequently.

This change means we stop the app from the main process first, before terminating the attach process.

Bug: https://github.com/flutter/flutter/issues/17833

* Roll engine to 56139397e6ae1257bdabd1ef79ff7aca96c67d4.6

Changes since last roll:
```
56139397e Roll src/third_party/skia 7ba1d64f0706..5f0726b01019 (12 commits) (#6104)
47a1ce0e6 Allow embedders to set the root surface transformation. (#6085)
```

* Roll engine to f3ff83a5db71262d240aa5337a2a9a22c73c4749. (dart roll).

* Add const

* Add ignore analyzer prefer_const_constructors_in_immutables

Update CONTRIBUTING.md to suggest Android Studio and fix Mac command to install android-platform-tools. (#19537)