This change introduces KeyboardSet and SubKeyboard XML definitions to
represent a set of keyboard layouts.
Bug: 5002108
Bug: 5679585
Change-Id: Ib6c8d5936187381bb6725c9fe574e93871c01a86
This change moves
* KeyboardSwitcher.getKeyboardId to KeyboardSet.<init> and
KeyboardSet.getKeyboardId.
* KeyboardSwitcher.getF2KeyMode to KeyboardSet.
This is the first step to get rid of shift state from Keyboard.
Bug: 5002108
Bug: 5679585
Change-Id: I2a5a97e5e89277bc606916d45c1afbc8d105d773