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This CL allows for spatialRendering to be queried with
MediaCapabilities.decodingInfo() for clear and EME. Changes required to blink
and media were relatively small so they were combined into this CL. This CL
does not add the ability to render spatial audio.

This functionality is behind blink feature flag MediaCapabilitiesSpatialAudio.
Note that if the flag is disabled, querying for spatialRendering will return
supported because decodingInfo ignores extraneous parameters by design.

For the media implementation, AudioType was because spatialRendering is
strictly tied to the codec.

Bug: 1020943

Change-Id: I01c9853b88f72ae8cb6291f9ca49e1d82cb220d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1928077Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Vi Nguyen <ving@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#721185}