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This CL prevents WebRTC clients from changing the VP9 lossless-color
property via a VideoControl message. This is because WebRTC handles
that setting via the SDP codec parameter "profile-id=1", which means
an SDP offer/answer exchange is needed to properly control this
setting. Non-WebRTC clients are not affected and they can still toggle
lossless-color via a VideoControl message.

This CL also adds logging to the VP9 encoder so we can verify what
settings are being applied at the codec level.

This also fixes a bug where the SDP parameter for lossless-color was
not being respected.

Bug: 1113499
Change-Id: I15ca83b0fcc157a3b63d3a3ca3509039ed47b24f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342126
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795973}