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This path is similar to MediaInterfaceProxy registered in
RenderFrameHost, except that VideoDecoderProxy only supports creating
video decoders. This will enable WebRTC's RTCVideoDecoderFactory to
create hardware video decoders using MojoVideoDecoder.

Bug: 857111
Change-Id: If960000688e636ade49d749bc99e9217f784e853
Reviewed-on: https://chromium-review.googlesource.com/1117214Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582779}