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Encoding API was mistakenly promoted stable earlier. This CL fixes this
and introduces a new MediaCapabilitiesEncodingInfo runtime enabled
feature marked as experimental.

Bug: 824708
Change-Id: I8f06982471ee544919fe427f782b8d8ccf21f7b5
Reviewed-on: https://chromium-review.googlesource.com/970463
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545036}