Provision to start base::SimpleTestTickClock at initial ticks

media/base/null_video_sink_unittest.cc

 // Copyright 2015 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 "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "media/base/null_video_sink.h"
 #include "media/base/test_helpers.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
 using testing::DoAll;
 using testing::Return;
 
 namespace media {
 
 ACTION_P(RunClosure, closure) {
   closure.Run();
 }
 
 class NullVideoSinkTest : public testing::Test,
                           public VideoRendererSink::RenderCallback {
  public:
-  NullVideoSinkTest() {
-    // Never use null TimeTicks since they have special connotations.
-    tick_clock_.Advance(base::TimeDelta::FromMicroseconds(12345));
-  }
+  NullVideoSinkTest()
+      :  // Never use null TimeTicks since they have special connotations.
+        tick_clock_(base::TimeTicks() +
+                    base::TimeDelta::FromMicroseconds(12345)) {}
   ~NullVideoSinkTest() override {}
 
   scoped_ptr<NullVideoSink> ConstructSink(bool clockless,
                                           base::TimeDelta interval) {
     scoped_ptr<NullVideoSink> new_sink(new NullVideoSink(
         clockless, interval,
         base::Bind(&NullVideoSinkTest::FrameReceived, base::Unretained(this)),
         message_loop_.task_runner()));
     new_sink->set_tick_clock_for_testing(&tick_clock_);
     return new_sink;
@@ skipping 99 matching lines @@
                                 current_time + (i + 1) * interval, false))
           .WillOnce(DoAll(RunClosure(event.GetClosure()), Return(nullptr)));
     }
   }
   event.RunAndWait();
   ASSERT_LT(base::TimeTicks::Now() - now, kTestRuns * interval);
   sink->Stop();
 }
 
 }  // namespace media