Add receive bitrates to histogram stats:

- total bitrate ("WebRTC.Video.BitrateReceivedInKbps")
- media bitrate ("WebRTC.Video.MediaBitrateReceivedInKbps")
- rtx bitrate ("WebRTC.Video.RtxBitrateReceivedInKbps")
- padding bitrate ("WebRTC.Video.PaddingBitrateReceivedInKbps")

BUG=crbug/419657
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/27189005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7756 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/receive_statistics_impl.h

@@ -33,6 +33,8 @@ class StreamStatisticianImpl : public StreamStatistician {
   virtual bool GetStatistics(RtcpStatistics* statistics, bool reset) OVERRIDE;
   virtual void GetDataCounters(size_t* bytes_received,
                                uint32_t* packets_received) const OVERRIDE;
+  virtual void GetReceiveStreamDataCounters(
+      StreamDataCounters* data_counters) const OVERRIDE;
   virtual uint32_t BitrateReceived() const OVERRIDE;
   virtual void ResetStatistics() OVERRIDE;
   virtual bool IsRetransmitOfOldPacket(const RTPHeader& header,
@@ -83,6 +85,9 @@ class StreamStatisticianImpl : public StreamStatistician {
   size_t received_packet_overhead_;
   StreamDataCounters receive_counters_;
 
+  // Stored counter values. Includes sum of reset counter values for the stream.
+  StreamDataCounters stored_sum_receive_counters_;
+
   // Counter values when we sent the last report.
   uint32_t last_report_inorder_packets_;
   uint32_t last_report_old_packets_;