20568 Reland: Create PlatformView instance right after method channel call from Dart (cla: yes, platform-android, platform-ios)

20610 Release the AccessibilityBridge when destroying a legacy FlutterView (cla: yes, platform-android, waiting for tree to go green)

20617 [embedder] Add FBO callback that takes frame info (cla: yes, platform-android, platform-ios, waiting for tree to go green)

20622 Fix NPE in PlatformViewsController.checkInputConnectionProxy (cla: yes, platform-android)

20672 [embedder] Add gl present callback that takes present info (cla: yes, platform-android, platform-ios, waiting for tree to go green)

20701 Ignore calls to AccessibilityBridge listeners after release (cla: yes, platform-android)