Incorporating logging into Cast

media/cast/rtp_sender/rtp_sender.h

Index: media/cast/rtp_sender/rtp_sender.h
diff --git a/media/cast/rtp_sender/rtp_sender.h b/media/cast/rtp_sender/rtp_sender.h
index 45fd987f7bdb079c8cc2260c01b148301cdd48d2..f56d7efc9fe577b80ce159e36092848968144367 100644
--- a/media/cast/rtp_sender/rtp_sender.h
+++ b/media/cast/rtp_sender/rtp_sender.h
@@ -14,6 +14,7 @@
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "media/cast/cast_config.h"
+#include "media/cast/cast_environment.h"
 #include "media/cast/rtp_sender/packet_storage/packet_storage.h"
 #include "media/cast/rtp_sender/rtp_packetizer/rtp_packetizer.h"
 #include "media/cast/rtp_sender/rtp_packetizer/rtp_packetizer_config.h"
@@ -30,7 +31,7 @@ struct RtcpSenderInfo;
 // acknowledged by the remote peer or timed out.
 class RtpSender {
  public:
-  RtpSender(base::TickClock* clock,
+  RtpSender(scoped_refptr<CastEnvironment> cast_environment,
             const AudioSenderConfig* audio_config,
             const VideoSenderConfig* video_config,
             PacedPacketSender* transport);
@@ -52,7 +53,7 @@ class RtpSender {
  private:
   void UpdateSequenceNumber(std::vector<uint8>* packet);
 
-  base::TickClock* const clock_;  // Not owned by this class.
+  scoped_refptr<CastEnvironment> cast_environment_;
   RtpPacketizerConfig config_;
   scoped_ptr<RtpPacketizer> packetizer_;
   scoped_ptr<PacketStorage> storage_;