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Animations into overview has changed so that non visible windows do not
need to animation. Previous rounded edges code relied on animation end to
apply mask, this cl applies mask to all cases, and removes before animations,
and reapplies after animation.

Test: ash_unittests WindowSelectorTest.RoundedEdgeMaskVisibility
Bug: 817860
Change-Id: I9da0e2a56e991a7c3073a4c2c0de79d8e3799915
Reviewed-on: https://chromium-review.googlesource.com/953135Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541690}