12610 Revert “[fuchsia] Wire up OpacityLayer to Scenic (#11322)” (cla: yes)

12618 Add isFocusable to SemanticsFlag (cla: yes)

12681 Create a package-able incremental compiler (cla: yes)

12695 Add onUnregistered callback in ‘Texture’ and ‘FlutterTexture’ (cla: yes)

12698 [web_ui] Fixing invalid state bug for text editing (affects: text input, cla: yes, platform-web)

12699 Adding ‘pub get’ to the ‘compile_xxxx.sh’ in the Scenario app (cla: yes)

12700 Add missing flag for embedder. (cla: yes)

12701 Cleanup: Made a macro to assert ARC is enabled. (cla: yes)