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/webrtc@5117 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/vie_encoder.h b/video_engine/vie_encoder.h
index 7177f8f..f80699c 100644
--- a/video_engine/vie_encoder.h
+++ b/video_engine/vie_encoder.h
@@ -181,7 +181,7 @@
 
   // Called by PacedSender.
   bool TimeToSendPacket(uint32_t ssrc, uint16_t sequence_number,
-                        int64_t capture_time_ms);
+                        int64_t capture_time_ms, bool retransmission);
   int TimeToSendPadding(int bytes);
  private:
   bool EncoderPaused() const;