Notify visibility change if source visibility is changed

This makes view root dispatch the up-to-date WindowInsets to the app.

Fix: 166619182
Test: Steps in the bug (comment#12)
Change-Id: I8c47e3be84357f65084a7d9994f7d7b68f15611e
(cherry picked from commit fd9435130557b054d203835eab6f287fee58ec1b)
1 file changed