Add Cast PLI support on sender side.

media/cast/net/mock_cast_transport_sender.h

Index: media/cast/net/mock_cast_transport_sender.h
diff --git a/media/cast/net/mock_cast_transport_sender.h b/media/cast/net/mock_cast_transport_sender.h
index bf1dfc0dc1ae7e11ec3aba05bdb9dca1a8c75066..3ee8f480abbbf4f969973b91a87a39a8f8c87cc9 100644
--- a/media/cast/net/mock_cast_transport_sender.h
+++ b/media/cast/net/mock_cast_transport_sender.h
@@ -18,14 +18,16 @@ class MockCastTransportSender : public CastTransportSender {
   MockCastTransportSender();
   virtual ~MockCastTransportSender();
 
-  MOCK_METHOD3(InitializeAudio, void(
-      const CastTransportRtpConfig& config,
-      const RtcpCastMessageCallback& cast_message_cb,
-      const RtcpRttCallback& rtt_cb));
-  MOCK_METHOD3(InitializeVideo, void(
-      const CastTransportRtpConfig& config,
-      const RtcpCastMessageCallback& cast_message_cb,
-      const RtcpRttCallback& rtt_cb));
+  MOCK_METHOD4(InitializeAudio,
+               void(const CastTransportRtpConfig& config,
+                    const RtcpCastMessageCallback& cast_message_cb,
+                    const RtcpRttCallback& rtt_cb,
+                    const RtcpPliCallback& pli_cb));
+  MOCK_METHOD4(InitializeVideo,
+               void(const CastTransportRtpConfig& config,
+                    const RtcpCastMessageCallback& cast_message_cb,
+                    const RtcpRttCallback& rtt_cb,
+                    const RtcpPliCallback& pli_cb));
   MOCK_METHOD2(InsertFrame, void(uint32_t ssrc, const EncodedFrame& frame));
   MOCK_METHOD3(SendSenderReport,
                void(uint32_t ssrc,
@@ -37,11 +39,12 @@ class MockCastTransportSender : public CastTransportSender {
   MOCK_METHOD2(ResendFrameForKickstart, void(uint32_t ssrc, uint32_t frame_id));
   MOCK_METHOD0(PacketReceiverForTesting, PacketReceiverCallback());
   MOCK_METHOD1(AddValidSsrc, void(uint32_t ssrc));
-  MOCK_METHOD7(SendRtcpFromRtpReceiver,
+  MOCK_METHOD8(SendRtcpFromRtpReceiver,
                void(uint32_t ssrc,
                     uint32_t sender_ssrc,
                     const RtcpTimeData& time_data,
                     const RtcpCastMessage* cast_message,
+                    const RtcpPliMessage* pli_message,
                     base::TimeDelta target_delay,
                     const ReceiverRtcpEventSubscriber::RtcpEvents* rtcp_events,
                     const RtpReceiverStatistics* rtp_receiver_statistics));