Fixes for setClipBounds()

Fixes for setClipBounds()

The invalidate region when the clip bounds are set needs to encompass both
the old clip bounds and the new bounds, to make sure that the right area
of the view gets erased as well as drawn.

Also, we need to keep our own internal copy of the bounds, not just use the
instance passed into the setter.

Issue #8634060 setClipBounds() problems

Change-Id: I123c49cff16e3debe8866974a5612a4efd010de4