Scale the leash for expand/collpase PiP transition

Screenshot: http://go/recall/~/AiNKCdFJI/efMwmlmBcsI6SpTGbpbHiZ

Bug: 150810705
Test: manually expand/collpase PiP window
Change-Id: Ie0c16c9eec65bce690fa67f80b551f3d8df0c3e9
3 files changed