Add TabletUI support

Change-Id: I26dd8f8d5cec2794f91b107641c42b826b037d7b

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

Original commit: https://github.com/timduru/platform-frameworks-base/commit/6ef4ab98fd0d890a3b6f092e7e74df009e0f618b