Fix for RTX in combination with pacing.

Retransmissions didn't get sent over RTX when pacing was enabled since
the pacer didn't keep track of whether a packet was a retransmit or not.

BUG=1811
TEST=trybots
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3779004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5117 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

@@ -126,8 +126,10 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
       const RTPFragmentationHeader* fragmentation = NULL,
       const RTPVideoHeader* rtp_video_hdr = NULL) OVERRIDE;
 
-  virtual bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                                int64_t capture_time_ms) OVERRIDE;
+  virtual bool TimeToSendPacket(uint32_t ssrc,
+                                uint16_t sequence_number,
+                                int64_t capture_time_ms,
+                                bool retransmission) OVERRIDE;
   // Returns the number of padding bytes actually sent, which can be more or
   // less than |bytes|.
   virtual int TimeToSendPadding(int bytes) OVERRIDE;