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We need media::VideoFrame for passing information of output buffers in
VideoDecoder migration at ARC++. This CL adds the mojo struct for it.

BUG=b:136716638
TEST=components_unittests --gtest_filter=VideoAcceleratorStructTraitsTest.*

Change-Id: I8ba1a47d20bdc07c5281e57ce7d78636144b36a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1697502
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697076}