asapersson fc5e81c979 Replace first_packet_sent_ms_ in Call.
Instead of using the time on the first callback to Call::OnSentPacket, use the time when the first packet is sent from the pacer (to make sure this packet corresponds to an audio/video RTP packet).

BUG=webrtc:6244

Review-Url: https://codereview.webrtc.org/2825333002
Cr-Commit-Position: refs/heads/master@{#17777}
2017-04-20 06:28:53 +00:00
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2017-04-20 06:28:53 +00:00
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