19700 Fixes typo in android_context_gl.h (cla: yes, platform-android)

19702 Prevent that removeActivityResultListener() is causing an ConcurrentModificationException (cla: yes, platform-android)

19717 Add flag to indicate whether the platform supports state restoration (cla: yes, platform-android)

19776 1.20.0-7.2.pre engine cherrypicks (cla: yes, platform-android)

19848 Cherry pick 3d104f43649d333492dfa792968c8a09af93a84c (cla: yes, platform-android, platform-ios)

19860 Support talkback in hybrid composition (cla: yes, platform-android, waiting for tree to go green)