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WindowGrid::PositionWindows is called at multiple places to animate
windows in overview mode. Reset the should_animate_when_entering_ flag
in order to animate in other situations.

Bug: 817888
Test: WindowSelectorTest.WindowItemCanAnimateOnDragRelease
Change-Id: I14a773033982c47823e6a0e331b7b8df4baa1791
Reviewed-on: https://chromium-review.googlesource.com/952671
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541689}