Previous implementation processed Overlay touch after other children in
a ViewGroup; it should be the other way around.
Also, fixed some invalidation issues.
Finally, added new behavior to automatically place View which is already
parented into the same global position, by calculating where the overlay is
on the screen relative to the previous parent of the View.
Issue #8459085 Overlay needs to handle touch correctly
Change-Id: Ic2cee12d2bc345f64ed3f4d855a5c3496967a201
9c17fe693d