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This parses the codec information in EncodedVideoConfig. Size has to
be explicitly specified in the config as well. With these changes,
a basic VP9 encoding and decoding test can run correctly. This test
can also cover the path of creating ImageBitmap from hardware decoder
VideoFrame.

Bug: 897297
Change-Id: Ifbac15db0305bcd781786707916b94be5a151215
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2301590
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790744}