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This CL adds SupportedVideoDecoderConfig to match the mojom struct.
It also adds a struct traits for them, and converts the existing
mojo code to use the media:: rather than the mojom:: version.

This will make it easier for {D3D11, MediaCodec}VideoDecoder to
return their media::SupportedVideoDecoderConfigs, since they cannot
use mojo directly.

Bug: 918029
Change-Id: Id0403ccadaa1b3fbbb310f01fd9b3a7bebc92ba7
Reviewed-on: https://chromium-review.googlesource.com/c/1392350
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619729}