cc: Convert TransformedClipParent test to LayerImpl
cc: Convert TransformedClipParent test to LayerImpl

This test wants to poke at render surface values, which is only valid on
the compositor thread.

R=weiliangc@chromium.org
BUG=502041, 504466
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1256993005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#340787}

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