20836 Track lock key down state instead of lock state (affects: desktop, cla: yes, needs tests, platform-linux)

20868 Deprecate Android v1 embedding classes (cla: yes, platform-android, waiting for tree to go green)

20962 Split out EmbedderTest{Context,Compositor} to handle software and GL separately (cla: yes, waiting for tree to go green)

20963 running screenshot tests on ios-safari unit tests (cla: yes)

20972 Added keyEvent support for iOS 13.4+  (cla: yes, platform-ios, waiting for tree to go green)

20981 Clean up deprecated EncodableValue code (cla: yes)

20997 add checker board for clip_path,clip_rect,clip_rrect,physical_shap_layer (cla: yes)