With this change,
- Shift and Shift lock state of keyboard is maintained by
LatinKeyboard.ShiftState.
- Shift key state is maintained by ShiftKeyState object in
KeyboardSwitcher.
- LatinIME informs KeyboardSwitcher that shift key press, release and
long press and KeyboardSwitcher determines which state LatinKeyboard
and ShiftLeyState should be.
Bug: 3193390
Change-Id: I948ef26fda512eb1cb0ebddc89d322c4f4f4d670
