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Now that we allow RGB VideoFrames through WebCodecs, we need to add
support in VideoResourceUpdater since BreakoutBox allows them to
reach our normal compositing path.

R=sandersd

Bug: 1167206,1167412
Test: Updated unittests.
Change-Id: Ie7a72128ab4bf65c72a5a8a41014700b9db7d677
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2634049
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844918}