zhihuang 6ba3b1976f Filter out some variables with initial -1 in the stats report.
If we call GetStats in PeerConnection before receiving the remote answer, we will get some variables in the StatsReports which are initially set to be -1.

Several conditions are added when extracting the info for the report in StatsCollector.

Those variables include:
gooRtt,
dataChannelId,
googEchoCancellationEchoDelayMedian,
googEchoCancellationEchoQualityMin,
googEchoCancellationEchoDelayStdDev,
googJitterReceived,
audioInputLevel,
googCaptureStartNtpTimeMs
packetsLost.

BUG=webrtc:3377

Review-Url: https://codereview.webrtc.org/1875873002
Cr-Commit-Position: refs/heads/master@{#12735}
2016-05-13 18:46:53 +00:00
..
2016-05-12 06:11:09 +00:00
2016-02-10 15:54:53 +00:00
2016-02-10 09:53:26 +00:00