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Establish a direct connection from the child (CanvasResourceDispatcher/
VideoFrameSubmitter) to the embedder (SuraceLayerBridge) so the child
can notify the embedder of its allocated SurfaceIds directly instead of
three process hops (renderer->viz->browser->renderer), hence reducing
latency and eliminating any IPC messages involved in this process.

Bug: 893850,883927
Change-Id: Ide595e3c6aa995c77678d6413d5ad6421e2d35e5
Reviewed-on: https://chromium-review.googlesource.com/c/1338411
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609469}