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This CL replaces the simple mus CompositorFrameMetadata struct with a
full fidelity struct along with StructTraits. w00t! Soon full fidelity
CompositorFrames in Mus without extra copies!

BUG=611802
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2042643002
Cr-Commit-Position: refs/heads/master@{#398222}