Provision to start base::SimpleTestTickClock at initial ticks

media/cast/sender/audio_sender_unittest.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.
 
 #include "media/cast/sender/audio_sender.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 55 matching lines @@
   int number_of_rtp_packets_;
   int number_of_rtcp_packets_;
 
   DISALLOW_COPY_AND_ASSIGN(TestPacketSender);
 };
 
 class AudioSenderTest : public ::testing::Test {
  protected:
   AudioSenderTest() {
     InitializeMediaLibrary();
-    testing_clock_ = new base::SimpleTestTickClock();
-    testing_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
+    testing_clock_ = new base::SimpleTestTickClock(base::TimeTicks::Now());
     task_runner_ = new test::FakeSingleThreadTaskRunner(testing_clock_);
     cast_environment_ =
         new CastEnvironment(scoped_ptr<base::TickClock>(testing_clock_),
                             task_runner_, task_runner_, task_runner_);
     audio_config_.codec = CODEC_AUDIO_OPUS;
     audio_config_.use_external_encoder = false;
     audio_config_.frequency = kDefaultAudioSamplingRate;
     audio_config_.channels = 2;
     audio_config_.bitrate = kDefaultAudioEncoderBitrate;
     audio_config_.rtp_payload_type = 127;
@@ skipping 66 matching lines @@
   base::TimeDelta max_rtcp_timeout =
       base::TimeDelta::FromMilliseconds(1 + kRtcpReportIntervalMs * 3 / 2);
   testing_clock_->Advance(max_rtcp_timeout);
   task_runner_->RunTasks();
   EXPECT_LE(1, transport_.number_of_rtp_packets());
   EXPECT_LE(1, transport_.number_of_rtcp_packets());
 }
 
 }  // namespace cast
 }  // namespace media