hbos a51d4f34d9 Re-land of RTCInboundRTPStreamStats.qpSum collected.
This was previously only collected for local tracks
(RTCOutboundRTPStreamStats.qpSum).

Spec: https://w3c.github.io/webrtc-stats/#dom-rtcrtpstreamstats-qpsum

This CL also improves some testing in rtcstatscollector_unittest.cc.
Default and non-default values are tested in the same unittests,
removing the test that was specific to default-values, which was
otherwise code duplication.

This is a re-land of https://codereview.webrtc.org/2675943002 after
dependent CL that was re-landed.

BUG=webrtc:7065
TBR=hta@webrtc.org, sakal@webrtc.org

Review-Url: https://codereview.webrtc.org/2703503003
Cr-Commit-Position: refs/heads/master@{#16642}
2017-02-16 13:34:48 +00:00
..
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