Replace uses of raw uint32's with a type-checked RtpTimeTicks data type.

media/cast/net/pacing/paced_sender.h

Index: media/cast/net/pacing/paced_sender.h
diff --git a/media/cast/net/pacing/paced_sender.h b/media/cast/net/pacing/paced_sender.h
index 4bc1f0b459fc6491c2ff3508d9e508a5f22337cb..bf1116eb267782c6ac55e976206d5084a57bcd9d 100644
--- a/media/cast/net/pacing/paced_sender.h
+++ b/media/cast/net/pacing/paced_sender.h
@@ -228,6 +228,11 @@ class PacedSender : public PacedPacketSender,
 
   bool has_reached_upper_bound_once_;
 
+  // Tracks recently-logged RTP timestamps so that it can expand the truncated
+  // values found in packets.
+  RtpTimeTicks last_logged_audio_rtp_timestamp_;
+  RtpTimeTicks last_logged_video_rtp_timestamp_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<PacedSender> weak_factory_;