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Prior to this fix, stale rectangles where showing at the start of a
new animation.

Bug: 1112848
Change-Id: Ie41eae474a2c2477b436a6b450cda099225f90f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341839
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796068}