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Overview mode is one of the complex areas for improving animation speed.
This cl implements a new proposal to tone down the animations.

Changes:
1. Enter animation: only animate currently visible windows and put the
rest of the windows in place.
2. Exit animation: animate all of the Most Recently Used (MRU) windows
up to and including the MRU maximized/fullscreen window, with the other
windows behind not moving until the maximized/fullscreen window finishes
animation.

Bug: 801465, 795988
Test: Tested new animations in different modes: normal, tablet, and splitview.

Change-Id: Ia7046c670bb484447752b8e5545fa81e981256d2
Reviewed-on: https://chromium-review.googlesource.com/882008
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Mitsuru Oshima (In Tokyo) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536957}