Adds APIs for reporting pacer queuing delay.

BUG=2775
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/8959005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5621 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/vie_encoder.h b/video_engine/vie_encoder.h
index 24bd720..d3271c3 100644
--- a/video_engine/vie_encoder.h
+++ b/video_engine/vie_encoder.h
@@ -109,6 +109,7 @@
   int32_t SendCodecStatistics(uint32_t* num_key_frames,
                               uint32_t* num_delta_frames);
 
+  int PacerQueuingDelayMs() const;
   int32_t EstimatedSendBandwidth(
         uint32_t* available_bandwidth) const;