22363 reland support uri launch in android (cla: yes, platform-android)

22429 Fix talkback in hybrid composition while using FlutterFragmentActivity (cla: yes, platform-android)

22434 Revert “[Android Text Input] Make the editing state listenable and allow batch edits “ (cla: yes, platform-android, waiting for tree to go green)

22435 [Android text input] Reland #21534 (cla: yes, platform-android, waiting for tree to go green)

22449 [flutter_releases] Flutter 1.22.4 engine cherrypicks (cla: yes, platform-android, platform-ios)

22468 Reverts 2 commits that remove surface dependance on external view embedder (cla: yes, platform-android, platform-ios)