* Fix #16464: Pass hit test when a big child is inside RenderFittedBox, RenderTransform, RenderFractionalTranslation, or RenderFollowerLayer

* Override `hitTestChildren`

* RenderTransform and RenderFollowerLayer shouldn't check if they are hit
themselves

* Test the hit test for translated child into translated box

* Add hit test for `FractionalTranslation`

* Don't check if RenderFractionalTranslation is hit themself

* Add hit test for FractionalTranslation

* Add test for FractionalTranslation

* abd74ed Add support for physical keyboards on Android (flutter/engine#5324)
* bb75825 Update buildroot to pull in msvc updates. (flutter/engine#5366)
* df7a02d Roll src/third_party/skia a0047bc..20027ce (19 commits) (flutter/engine#5365)
* 15bb9b8 Generate .packages for both flutter_kernel_transformers and frontend_server in the same way (flutter/engine#5362)
* 983f39c Don't enable LTO on Windows hosts as the toolchain does not read the value. (flutter/engine#5364)
* fb709e2 [fuchsia] Plumbing for sharing between AOT snapshots. (flutter/engine#5351)
* 416418f Roll src/third_party/skia 75bf216..a0047bc (5 commits) (flutter/engine#5363)
* b607382 Improve licenses script (flutter/engine#5355)
* c8050e8 Generate frontend server's .packages from Dart .packages file instead of using pub get. (flutter/engine#5360)
* 4d89213 Roll src/third_party/skia 84a4e5c..75bf216 (5 commits) (flutter/engine#5361)
* f24fdba Roll src/third_party/skia/ e9c81ee2e..84a4e5c00 (1 commit) (flutter/engine#5359)
* c622c68 Roll src/third_party/skia/ 8517631bf..e9c81ee2e (1 commit) (flutter/engine#5358)
* 93b3b26 Roll src/third_party/skia/ d416083ee..8517631bf (3 commits; 2 trivial rolls) (flutter/engine#5357)
* 9b51b89 Roll src/third_party/skia/ 13235d896..d416083ee (3 commits) (flutter/engine#5356)

They've been mostly green since https://github.com/flutter/flutter/pull/17812

This reverts commit 39d7f22a.

Allows one to use a different core snapshot without a custom engine build by just packaging a different one in the APK.

This fixes a runtime error triggered when calling `invokeRpc`:
```
type 'Future<dynamic>' is not a subtype of type 'Future<Map<String, dynamic>>'
```

Also adds a log message for why connections are failing, as well as a
default timeout when attempting to connect to a websocket.

Fixes https://github.com/flutter/flutter/issues/17597

Related to:

#14822
Dart-Code/Dart-Code#490
#13379

* pass semantics children in traversal and hit test orders

* explain why we are inverting _children

* Roll engine

(contains roll of Dart to version
97b6c2e09d6532eeb622d85f23109f3f3b6d2b61 )

(contains skia roll to 037be4e032ef31d7bc0cf914c972af97c456b17f)

* Patch to fix builds with custom targets on iOS simulator. #16787

* Fix for unused import.

* Code review changes applied.

Scan folders when asset specified finishes with `/`

This optimizes the AnimatedSwitcher so that it tags the right widget with its keyed subtree, and avoids rebuilding the transition unnecessarily.

This significantly improves the performance of Chips (which uses AnimatedSwitcher to swap out it's avatar and delete icon children).

This is a follow up on issue #17169 and the pull request #17298

This pull request adds the onChangeStart and onChangeEnd callbacks for CupertinoSlider. These are called when a user starts and ends a change respectively.

Pushing for @dcaraujo0872, the PR author.

This allows test environments other than `flutter test` to have a hook
into the test exception reporting. Some test environments, for example,
don't just dump error details to the console, but rather require them
to be reported to a separate server.