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

media/cast/test/cast_benchmarks.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This program benchmarks the theoretical throughput of the cast library.
 // It runs using a fake clock, simulated network and fake codecs. This allows
 // tests to run much faster than real time.
 // To run the program, run:
 // $ ./out/Release/cast_benchmarks | tee benchmarkoutput.asc
 // This may take a while, when it is done, you can view the data with
@@ skipping 110 matching lines @@
     if (ssrc == audio_ssrc_) {
       *encoded_audio_bytes_ += frame.data.size();
     } else if (ssrc == video_ssrc_) {
       *encoded_video_bytes_ += frame.data.size();
     }
     transport_->InsertFrame(ssrc, frame);
   }
 
   void SendSenderReport(uint32_t ssrc,
                         base::TimeTicks current_time,
-                        uint32_t current_time_as_rtp_timestamp) final {
+                        RtpTimeTicks current_time_as_rtp_timestamp) final {
     transport_->SendSenderReport(ssrc,
                                  current_time,
                                  current_time_as_rtp_timestamp);
   }
 
   void CancelSendingFrames(uint32_t ssrc,
                            const std::vector<uint32_t>& frame_ids) final {
     transport_->CancelSendingFrames(ssrc, frame_ids);
   }
 
@@ skipping 575 matching lines @@
   media::cast::CastBenchmark benchmark;
   if (getenv("PROFILE_FILE")) {
     std::string profile_file(getenv("PROFILE_FILE"));
     base::debug::StartProfiling(profile_file);
     benchmark.Run();
     base::debug::StopProfiling();
   } else {
     benchmark.Run();
   }
 }