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This adds the VP8/9 frame quantizer to the stats for each frame.
This will enable the website to show a graph of these values over time.

This also adds new FrameStats unittests, and fixes a capturer_id
initialization bug discovered by the unittest.

Bug: 888833
Change-Id: I2c48f9c024a0e64a6a5756a3371717d3491a8474
Reviewed-on: https://chromium-review.googlesource.com/1242398
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594934}