asapersson 09f0561675 Update adaptation stats to support degradations in both resolution and framerate.
Add AdaptCounter class which holds the number of downgrade counts per degradation way (resolution/fps) and reason (cpu/quality).

BUG=webrtc:7607

Review-Url: https://codereview.webrtc.org/2871623002
Cr-Commit-Position: refs/heads/master@{#18156}
2017-05-16 06:40:18 +00:00
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