* colorSpace, colorRange and colorTransfer are relevant to all videos.
* The rest of the fields are relevant only to HDR videos.
* Tested on a prototype device that decodes VP9 profile 2, 10 bit.
* The Webm spec spells color as 'colour' so the webm id reference use the same spelling.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=154098189
