George Mount 96eb6ca719
Use transparent instead of null background during Activity Transitions ...
Bug 32952142
When doing activity transitions, a window is temporarily translucent
during the transition. When a view hierarchy completely covers the
window, the background is never seen and applications can use a
null background to avoid overdraw. However, during the activity
transition, the underlying activity is seen during the transition.
With a null background, the buffer isn't properly cleared and
the uncleared buffer will show strange effects.
This CL forces a transparent background temporarily during the
activity transition to avoid this problem.
Test: manual testing using test application
Change-Id: I63f24dba3c2f810944bcbf07faf309f9f1c5889a
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96eb6ca719