This change encapsulates mInKeyRepeat (former mRepeatKeyIndex) into
UIHandler class. Also this eliminates mCurrentKey and mLastTapTime
dependency from repeatKey method.
Bug: 2910379
Change-Id: I9351a558be2ebc04de4ebb0d323af4be33bd470c
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