Freeze screen while changing expanded desktop mode.

Also animate from old to new state.

Change-Id: I2db8ec4d55f7b8b5e592cc1ef21b86ebdbd00eb0
PhoneWindowManager: Delay setting updates during window animation.

Change-Id: I90ee5d8f83176a38a32b5ff38c4b191f1b78532e
Fix expanded desktop layout in landscape

Change-Id: I9292ff994c2b5b185d47222be98665f36e528068