Add an extra colored layer when animating launches (1/2)

This CL adds an extra layer with the same color as the app background
color when animating an app launch (e.g. from notification, QS, media,
etc). This allows to avoid a "flash effect" that could be caused when
the background color of the expanding view is bright, which is often the
case for QS tiles.

See b/188185381#comment5 for before/after videos.

Bug: 186189658
Test: Long press a quick settings tile
Change-Id: Ifc0cda3b03795549ddd7c333a9302e7ea298ac6a