This reverts commit 8c0b43bd.

2d42c74a3 Replace Pipeline's `ProduceToFront` with `ProduceIfEmpty` to handle thread merging. (flutter/engine#17122) (#52972)

77e6d32a1 Roll src/third_party/skia f22744971516..85755f46a881 (1 commits) (flutter/engine#17225) (#52966)

* Move mouse_tracking to rendering

* Move test

6aedbb7d3 Roll src/third_party/skia 4b55ff097b9d..f22744971516 (1 commits) (flutter/engine#17224) (#52964)

8dbb8ca70 Roll src/third_party/dart 5b21a43c556c..1bab476834dc (41 commits) (flutter/engine#17219) (#52938)

fix KeySet.hashCode; enable multiple web tests

This reverts commit 11efa00f.

In certain circumstances, the .packages file or dart cache could be missing - since the tool runs from a snapshot this is otherwise fine. 

b1af234b7 Disable the use of the API_AVAILABLE macro in Skia in iOS release builds. (flutter/engine#17213) (#52924)

* Allow projects that don't have tests on every platform.
  We don't really need to enforce that random projects have
  tests on every platform.

* Add some text at the end of the shard so we know it's
  actually running all the tests.

046a4a6c2 Roll src/third_party/skia 1171d314efc7..4b55ff097b9d (2 commits) (flutter/engine#17214) (#52917)

Reland of #52091

This reverts commit f65421aa.

Remove dependency injection from GenSnapshot and AotBuilder and update tests to use FakeProcessManager