Add histogram stats for send delay for a sent video stream.

webrtc/call/call.cc

Index: webrtc/call/call.cc
diff --git a/webrtc/call/call.cc b/webrtc/call/call.cc
index 4682e926bd719bc4a01fed9129e90ad1a5114dd7..b7980382cfa16664685c469e5e18f4838c696e0e 100644
--- a/webrtc/call/call.cc
+++ b/webrtc/call/call.cc
@@ -568,6 +568,11 @@ void Call::OnSentPacket(const rtc::SentPacket& sent_packet) {
   if (first_packet_sent_ms_ == -1)
     first_packet_sent_ms_ = clock_->TimeInMilliseconds();
   congestion_controller_->OnSentPacket(sent_packet);
+
+  ReadLockScoped read_lock(*send_crit_);
+  for (VideoSendStream* stream : video_send_streams_) {
+    stream->OnSentPacket(sent_packet.packet_id);

[stefan-webrtc, 2015/12/10 08:37:49]

Should this method return if the packet belonged to that send stream so that we
don't have to loop over all send streams? Or would it make sense to actually
move send delay tracking to Call instead? Maybe we want to track this per
stream.

[åsapersson, 2015/12/15 14:28:26]

Done.
See other comment about per stream.

+  }
 }
 
 void Call::OnNetworkChanged(uint32_t target_bitrate_bps, uint8_t fraction_loss,