This change simplifies onModifierTouchEvent to focus on handling motion event related to a key event. Other refactoring will follow in order to support multi touch. Bug: 2910379 Change-Id: I036be64168d951a535600a7910b36bc109f88490
TODO: Cleanup will follow. Change-Id: I4a68ba9f2f55760aa24187f1f13fdfa8a0b70963