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In display_compositor, we have CompositorFrameSink and CompositorFrameSinkClient
interface. Since we already have cc/output/compositor_frame_sink class,
it makes more sense to move these two interfaces to cc/ipc.
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2344183002
Cr-Commit-Position: refs/heads/master@{#419248}