Corrects invalidation logic for layered views

A bug in the invalidation logic meant that changes to a view
would not cause parents in the view hiearchy that were set to have
a layer (e.g., View.LAYER_TYPE_HARDWARE) to get invalidated properly.
So even though the child view was all set to recreate its display list
according to the property change, the layer in the tree above it would stay
as-is, meaning that the change would not show up on the screen.

Issue #5887530 DropTarget text does not change color with the icon

Change-Id: Ie6eac4f406d172cb437822d9fe76340ab2afaf1c