this attribute can be set through a regular transaction using
SurfaceComposerClient (just like any other attribute, eg: position or size)
Change-Id: I701a47c677ea6442ca713728a93335328cd2b172
This change adds a crop rectangle specified in window coordinates to the layer
state. The all window pixels outside this crop rectangle are treated as though
they were fully transparent. This change also adds the plumbing necessary for
WindowManager to set that crop.
Change-Id: I582bc445dc8c97d4c943d4db8d582a6ef5a66081
