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It can improve the fps of overview window dragging about 4~5fps.

Bug: 925131, 925122
Change-Id: Ia76d1baf2e8a35f5dd53e1ec7bb325ab4f6c45eb
Reviewed-on: https://chromium-review.googlesource.com/c/1439930
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626906}