This is the first step to support separate Keyboard for elementName.
This change is the second attempt of Icef66564.
Change-Id: I78ea6cb9ea3d965ff89e0ff5d896a6b11ba5c670
This change introduces KeyboardSet and SubKeyboard XML definitions to
represent a set of keyboard layouts.
Bug: 5002108
Bug: 5679585
Change-Id: Ib6c8d5936187381bb6725c9fe574e93871c01a86