Provision to start base::SimpleTestTickClock at initial ticks

media/cast/sender/audio_sender_unittest.cc

Index: media/cast/sender/audio_sender_unittest.cc
diff --git a/media/cast/sender/audio_sender_unittest.cc b/media/cast/sender/audio_sender_unittest.cc
index 68199281238d05bd4bc0a3f8b20e8d2725e63257..aa870ef6648b77fce5ab83e36f6c5666002dc692 100644
--- a/media/cast/sender/audio_sender_unittest.cc
+++ b/media/cast/sender/audio_sender_unittest.cc
@@ -73,8 +73,7 @@ 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_),