honghaiz 9ad0db51a6 Dampening connection switch.
If the currently selected connection becomes not receiving and if a backup connection
becomes strong first, we will not switch the connection until X milliseconds is passed
but the selected connection is still not receiving and the backup connection is still receiving. This will prevent the connection switching from happening too frequently.

BUG=

Review-Url: https://codereview.webrtc.org/2143653005
Cr-Commit-Position: refs/heads/master@{#13480}
2016-07-15 02:30:32 +00:00
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2016-07-15 02:30:32 +00:00
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