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The title bars should not visible while animating overview mode. This cl
hides the title bar if needed and waits until the next paint before
animating the windows. This will hide the title bar as expected while
keeping the benefits of DeferPaint.

Test: manual
Bug: 843851
Change-Id: I99cf7ca39fd1ae14314ac406abd0fec999e2c024
Reviewed-on: https://chromium-review.googlesource.com/1112774Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573552}