Fix problem when we did not play beginning of HTML5 audio stream in low latency mode.

media/audio/audio_output_controller_unittest.cc

 // Copyright (c) 2011 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/environment.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/task.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 36 matching lines @@
 };
 
 class MockAudioOutputControllerSyncReader
     : public AudioOutputController::SyncReader {
  public:
   MockAudioOutputControllerSyncReader() {}
 
   MOCK_METHOD1(UpdatePendingBytes, void(uint32 bytes));
   MOCK_METHOD2(Read, uint32(void* data, uint32 size));
   MOCK_METHOD0(Close, void());
+  MOCK_METHOD0(DataReady, bool());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockAudioOutputControllerSyncReader);
 };
 
 static bool HasAudioOutputDevices() {
   AudioManager* audio_man = AudioManager::GetAudioManager();
   CHECK(audio_man);
   return audio_man->HasAudioOutputDevices();
 }
@@ skipping 257 matching lines @@
   controller->Close(base::Bind(&SignalClosedEvent, &closed_event_1));
 
   base::WaitableEvent closed_event_2(true, false);
   controller->Close(base::Bind(&SignalClosedEvent, &closed_event_2));
 
   closed_event_1.Wait();
   closed_event_2.Wait();
 }
 
 }  // namespace media