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This CL also wires these constraints to Blink's internal
goog_auto_gain_control and goog_noise_suppression respectively.
This automatically provides support for these constraints in
mediaDevices.getUserMedia(), MediaStreamTrack.applyConstraints()
and MediaStreamTrack.getConstraints().

Intent to ship:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/ANta5sQXoGA

Bug: 823831
Change-Id: I71c84e6464533de8abfb51fb12d774849b34a91f
Reviewed-on: https://chromium-review.googlesource.com/975501Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Chandan Padhi <c.padhi@samsung.com>
Cr-Commit-Position: refs/heads/master@{#545075}