fix ghost clipBounds problem

OverlayViewGroup clipChildren=true, so that RenderNode
of GhostView will be forced clip its content to its bounds.
Because GhostView is transformed to a different location
other than (0,0),  the content left/up to the bounds
is clipped out.

Introduce another clipChildren=false view between
OverlayViewGroup and GhostView.

b/16982904

Change-Id: Ia11926c78e19bffe80c3d4584a59b83b2fbee6df