Add video send bitrates to histogram stats:

- total bitrate ("WebRTC.Video.BitrateSentInKbps")
- media bitrate ("WebRTC.Video.MediaBitrateSentInKbps")
- rtx bitrate ("WebRTC.Video.RtxBitrateSentInKbps")
- padding bitrate ("WebRTC.Video.PaddingBitrateSentInKbps")
- retransmitted bitrate ("WebRTC.Video.RetransmittedBitrateInKbps")

Add retransmitted bytes to StreamDataCounters.

Change in UpdateRtpStats to also update counters for retransmitted packet.

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

Review URL: https://webrtc-codereview.appspot.com/30199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7838 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/interface/receive_statistics.h

@@ -57,7 +57,7 @@ class ReceiveStatistics : public Module {
 
   // Updates the receive statistics with this packet.
   virtual void IncomingPacket(const RTPHeader& rtp_header,
-                              size_t bytes,
+                              size_t packet_length,
                               bool retransmitted) = 0;
 
   // Increment counter for number of FEC packets received.
@@ -85,7 +85,7 @@ class ReceiveStatistics : public Module {
 class NullReceiveStatistics : public ReceiveStatistics {
  public:
   virtual void IncomingPacket(const RTPHeader& rtp_header,
-                              size_t bytes,
+                              size_t packet_length,
                               bool retransmitted) OVERRIDE;
   virtual void FecPacketReceived(uint32_t ssrc) OVERRIDE;
   virtual StatisticianMap GetActiveStatisticians() const OVERRIDE;