19221 JNI glue for calling PlatformViewsController.createOverlaySurface (cla: yes, platform-android, waiting for tree to go green)

19223 Fix the return type of CreateContext (cla: yes, platform-android, waiting for tree to go green)

19226 Implement PlatformViewsController.createOverlaySurface (cla: yes, platform-android)

19228 Revert “Implement PlatformViewsController.createOverlaySurface” (cla: yes, platform-android)

19232 Use public accessor and move keep annotation (cla: yes, platform-android)

19242 Android platform view static thread merging (cla: yes, platform-android, platform-ios, waiting for tree to go green)

19245 Reland “Implement PlatformViewsController.createOverlaySurface” (cla: yes, platform-android, waiting for tree to go green)