19427 Synthesize touch events for hybrid views (cla: yes, platform-android)

19435 Revert unintended change (cla: yes, platform-android, waiting for tree to go green)

19482 FlutterView will handle dispatching all touch events to sub-views (cla: yes, platform-android)

19484 Track motion events for reuse post gesture disambiguation (cla: yes, platform-android)

19487 Switch to FlutterSurfaceView if no Android view is in the frame (cla: yes, platform-android, waiting for tree to go green)

19555 Resubmit frame when the surface is switched (cla: yes, platform-android)

19560 Add @Keep annotation to FlutterMutatorsStack (cla: yes, platform-android)