8690 Revert Rect/RRect 64 bit (cla: yes)

8692 Add tests from framework (cla: yes)

8695 Reland const Rect/RRect (cla: yes)

8698 Convert animated unpremul images to premul during decode (cla: yes)

8700 Increase the memory usage estimate for EngineLayer (cla: yes)

8704 Limit the size of VirtualDisplay we create in android (cla: yes)

8706 Rename tightWidth to longestLine (cla: yes)

8707 Document that OpacityLayer’s children are nonempty (cla: yes)

8710 Plumb arguments from Settings to Dart entrypoint (cla: yes)

8712 [scenic] Purge references to Mozart (cla: yes)