Added MediaSourceState unit test.

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 <memory>
 
 #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/gmock_callback_support.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() override {}
 
   std::unique_ptr<NullVideoSink> ConstructSink(bool clockless,
@@ skipping 109 matching lines @@
           .WillOnce(
               DoAll(RunClosure(event.GetClosure()), Return(test_frame_2)));
     }
   }
   event.RunAndWait();
   ASSERT_LT(base::TimeTicks::Now() - now, kTestRuns * interval);
   sink->Stop();
 }
 
 }  // namespace media