Added volume adjust sound behind the flag.

media/audio/sounds/test_data.h

Index: media/audio/sounds/test_data.h
diff --git a/media/audio/sounds/test_data.h b/media/audio/sounds/test_data.h
index d7fb11ddb6b837602aad95f5ed03b12d88692990..cd12e8ff24f96e31af5b3ad01da9d1d37077fc66 100644
--- a/media/audio/sounds/test_data.h
+++ b/media/audio/sounds/test_data.h
@@ -9,6 +9,8 @@
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "media/audio/sounds/audio_stream_handler.h"
+#include "media/audio/sounds/wav_parser.h"
+#include "media/audio/sounds/wav_reader.h"
 
 namespace base {
 class MessageLoop;
@@ -29,9 +31,11 @@ class TestObserver : public AudioStreamHandler::TestObserver {
 
   // AudioStreamHandler::TestObserver implementation:
   virtual void OnPlay() OVERRIDE;
+  virtual void OnReplay() OVERRIDE;
   virtual void OnStop(size_t cursor) OVERRIDE;
 
   int num_play_requests() const { return num_play_requests_; }
+  int num_replays() const { return num_replays_; }
   int num_stop_requests() const { return num_stop_requests_; }
   int cursor() const { return cursor_; }
 
@@ -40,12 +44,31 @@ class TestObserver : public AudioStreamHandler::TestObserver {
   base::Closure quit_;
 
   int num_play_requests_;
+  int num_replays_;
   int num_stop_requests_;
   int cursor_;
 
   DISALLOW_COPY_AND_ASSIGN(TestObserver);
 };
 
+class TestWavReader : public WavReader {
+ public:
+  explicit TestWavReader(const WavParser& parser);
+  virtual ~TestWavReader();
+
+  // WavReader implementation:
+  virtual bool AtEnd(size_t cursor) OVERRIDE;
+  virtual bool CopyTo(AudioBus* bus,
+                      size_t cursor,
+                      size_t* bytes_written) OVERRIDE;
+
+  void SimulateAtEndOnce();
+
+ private:
+  const WavParser parser_;
+  int num_simulate_at_end_requests_;
+};
+
 }  // namespace media
 
 #endif // MEDIA_AUDIO_SOUNDS_TEST_UTILS_H_