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Verified to work on Beta4. In overlay mode video looks great for both
HDR and 8-bit content. When we drop out of overlays and we're using
the validating cmd decoder HDR gets copied to non-HDR and looks wrong.
When using the passthrough cmd decoder, we just get black frames.

Remaining TODOs:
- Figure out how to get HDR displaying correctly out of overlay mode.
- Figure out difference between validating and passthrough cmd decoder.
- Skip reinitialize for config changes if possible.
- Still needs --no-sandbox until https://crrev.com/c/2346852 lands.
- Jank at playback startup for HDR content. https://crbug.com/1115333
- Playback hangs when starting with a seek. https://crbug.com/1115334

Bug: 1103432
Change-Id: I7d5860a49eee3856fec380eac8e78fdac798c117
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2290923Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797459}