This is needed to support for German umlaut handling for both gesture and typing input.
Bug: 8493920
Change-Id: I292e2a4911c54aa5566c38411016a220bb35a1f4
Add a new DigraphUtils class to manage digraph handling for both
gesture and typing input.
Bug: 8493920
Change-Id: I3a509e1311b9039653f9f488d3c28bb54205f416