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We need media::DecoderBuffer for passing input bitstream buffer.
This CL adds a mojo struct for it.

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

Change-Id: I96d23020630bb98b69e3ef1c3707e9dc31cb12ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699349Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697114}