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/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h b/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
index fd7b9a9..09c3ca6 100644
--- a/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
+++ b/modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
@@ -111,8 +111,9 @@
               const uint32_t payloadSize,
               const RTPFragmentationHeader* fragmentation,
               const RTPVideoHeader* rtpVideoHdr));
-  MOCK_METHOD3(TimeToSendPacket,
-      bool(uint32_t ssrc, uint16_t sequence_number, int64_t capture_time_ms));
+  MOCK_METHOD4(TimeToSendPacket,
+      bool(uint32_t ssrc, uint16_t sequence_number, int64_t capture_time_ms,
+           bool retransmission));
   MOCK_METHOD1(TimeToSendPadding,
       int(int bytes));
   MOCK_METHOD3(RegisterRtcpObservers,