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This CL handles transition keyframes when we composite background
color animation.

Bug: 1153670
Change-Id: I9252db7f7344472d8fc9f1866d1f5b2a038dd2f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589114
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840297}