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This CL allows for HDR to be queried with MediaCapabilities.decodingInfo
with hdrMetadataType, colorGamut, and transferFunction. Both Blink- and
Media-side changes are included. The feature is flagged by
MediaCapabilitiesDynamicRange.

Bug: 1048045
Change-Id: I9f144726bbc7aaead4dcc1c9f69cf536da1bf2a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035053
Commit-Queue: Vi Nguyen <ving@microsoft.com>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756829}