Provision to start base::SimpleTestTickClock at initial ticks

media/cast/test/simulator.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.
 
 // Simulate end to end streaming.
 //
 // Input:
 // --source=
 //   WebM used as the source of video and audio frames.
 // --output=
@@ skipping 275 matching lines @@
 //
 // |log_output_path| is the path to write serialized log.
 // |extra_data| is extra tagging information to write to log.
 void RunSimulation(const base::FilePath& source_path,
                    const base::FilePath& log_output_path,
                    const base::FilePath& metrics_output_path,
                    const base::FilePath& yuv_output_path,
                    const std::string& extra_data,
                    const NetworkSimulationModel& model) {
   // Fake clock. Make sure start time is non zero.
-  base::SimpleTestTickClock testing_clock;
-  testing_clock.Advance(base::TimeDelta::FromSeconds(1));
+  base::SimpleTestTickClock testing_clock(base::TimeTicks() +
+                                          base::TimeDelta::FromSeconds(1));
 
   // Task runner.
   scoped_refptr<test::FakeSingleThreadTaskRunner> task_runner =
       new test::FakeSingleThreadTaskRunner(&testing_clock);
   base::ThreadTaskRunnerHandle task_runner_handle(task_runner);
 
   // CastEnvironments.
   scoped_refptr<CastEnvironment> sender_env = new CastEnvironment(
       scoped_ptr<base::TickClock>(new test::SkewedTickClock(&testing_clock)),
       task_runner, task_runner, task_runner);
@@ skipping 410 matching lines @@
   values.SetString("sim-id", sim_id);
 
   std::string extra_data;
   base::JSONWriter::Write(values, &extra_data);
 
   // Run.
   media::cast::RunSimulation(source_path, log_output_path, metrics_output_path,
                              yuv_output_path, extra_data, model);
   return 0;
 }