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This CL hooks up everything required to pass the medialog object to
the ChromeOS video decoder. In the future this can be used to provide
move detailed information about the ChromeOS video decoders to
chrome://media-internals.

TEST=./video_decode_accelerator_tests --use_vd on nocturne

BUG=b:158716673

Change-Id: I52775eb85675a9d9d91d6c3d52f6a44ab7386d6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895015Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781593}