Add RTCP packet type counter (for getting statistics such as sent/received NACK and FIR).
Add counter to RTCP sender and RTCP receiver.
Add video api GetRtcpPacketTypes().

BUG=2638
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/8179004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5575 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/vie_channel.h b/video_engine/vie_channel.h
index 762f521..9991103 100644
--- a/video_engine/vie_channel.h
+++ b/video_engine/vie_channel.h
@@ -202,6 +202,9 @@
   void RegisterReceiveChannelRtpStatisticsCallback(
       StreamDataCountersCallback* callback);
 
+  void GetRtcpPacketTypeCounters(RtcpPacketTypeCounter* packets_sent,
+                                 RtcpPacketTypeCounter* packets_received) const;
+
   void GetBandwidthUsage(uint32_t* total_bitrate_sent,
                          uint32_t* video_bitrate_sent,
                          uint32_t* fec_bitrate_sent,