13189 Add utils to disable on mac/windows, disable invalid LibLxt tests on mac (cla: yes)

13190 [web] Fix canvas reuse metrics. Refactor drawVertices code. (cla: yes)

13192 Use window.devicePixelRatio in the CanvasKit backend (cla: yes)

13193 Custom compositor layers must take into account the device pixel ratio. (cla: yes)

13196 Document //flutter/runtime/dart_snapshot.h (cla: yes)

13207 Wrap the text in text editing to fix selections. (cla: yes)

13209 Preserve stdout colors of subprocesses run by felt (cla: yes, platform-web)

13211 Revert “Custom compositor layers must take into account the device pixel ratio.” (cla: yes)