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wutao authored
Currently we clone all the layers to do animation during screen rotation, which is slow on some of the devices. The solution is using compositor copy request to flatten the layer hierarchy and make animations more efficient. BUG=678763 R=oshima@chromium.org, bruthig@chromium.org TEST=Unittest with ScreenRotationAnimatorTest and Manual Review-Url: https://codereview.chromium.org/2780823002 Cr-Commit-Position: refs/heads/master@{#462658}
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