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The API of the video capture service currently depends on a native enum VideoPixelFormat
and a struct media.mojom.MailboxVideoFrameData declared in media_types.mojom. This CL breaks
this dependency by defining a (non-native) Mojo enum VideoCapturePixelFormat and a struct
media.mojom.MailboxBufferHandleSet specifically for the video capture service. This has
two benefits:
1.) It makes it clear from the API that the video capture service actually only supports a
much more limited set of pixel formats.
2.) It allows the reuse of the API definition in the mojom files in contexts where media/
and type mappings to native enums are not available. In particular, this is the case
when trying to use the video capture service API from ChromiumOS.

This is purely an interface refactoring. There is no intent for functional change.

TBR=xjz@chromium.org

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I418e5bb95bd92da0600afd874b6fde71e982761a
Reviewed-on: https://chromium-review.googlesource.com/1026795Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555718}