asapersson 4374a09f9b Only update codec type histogram if lifetime is long enough (10 sec).
Add metrics for Call/VideoSendStream/VideoReceiveStream lifetime.

BUG=

Review-Url: https://codereview.webrtc.org/2136533002
Cr-Commit-Position: refs/heads/master@{#13537}
2016-07-27 07:39:17 +00:00
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