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This initial version supports only I420. We'll want to implement
explicit conversion and probably color space metadata before adding
many more formats.

Bug: 1096722
Change-Id: I42949e2a7e9e2135fab260e73da2f2aa420eb424
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355390
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799773}