cc: Convert SurfacesShouldBeUnaffectedByEtc to LayerImpl

This test is looking at content rects for render surfaces, which is only
valid on the compositor thread.

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BUG=502041,504466
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1260693004

Cr-Commit-Position: refs/heads/master@{#340789}
1 file changed