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If we have an HDR video, send along any stream mastering metadata or
display metadata to the VideoProcessor.  This allows proper tone
mapping on some devices, such as the Radeon 5700.

Change-Id: I7b625fec44693c1abf85656c09342b1faae44ca4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107492
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756887}