Added volume adjust sound behind the flag.

media/audio/sounds/test_data.cc

Index: media/audio/sounds/test_data.cc
diff --git a/media/audio/sounds/test_data.cc b/media/audio/sounds/test_data.cc
index dc667c9996d567bed9418ec29edc82394722d933..5420cb173a671cfa81de562965db9070b830e1a6 100644
--- a/media/audio/sounds/test_data.cc
+++ b/media/audio/sounds/test_data.cc
@@ -13,22 +13,53 @@ TestObserver::TestObserver(const base::Closure& quit)
     : loop_(base::MessageLoop::current()),
       quit_(quit),
       num_play_requests_(0),
+      num_replays_(0),
       num_stop_requests_(0),
       cursor_(0) {
   DCHECK(loop_);
 }
 
-TestObserver::~TestObserver() {
-}
+TestObserver::~TestObserver() {}
 
 void TestObserver::OnPlay() {
   ++num_play_requests_;
 }
 
+void TestObserver::OnReplay() {
+  ++num_replays_;
+}
+
 void TestObserver::OnStop(size_t cursor) {
   ++num_stop_requests_;
   cursor_ = cursor;
   loop_->PostTask(FROM_HERE, quit_);
 }
 
+TestWavReader::TestWavReader(const WavParser& parser)
+    : parser_(parser),
+      num_simulate_at_end_requests_(0) {}
+
+TestWavReader::~TestWavReader() {}
+
+bool TestWavReader::AtEnd(size_t /* cursor */) {
+  if (!num_simulate_at_end_requests_)
+    return false;
+  --num_simulate_at_end_requests_;
+  return true;
+}
+
+bool TestWavReader::CopyTo(AudioBus* bus,
+                           size_t /* cursor */,
+                           size_t* bytes_written) {
+  if (!bus)
+    return false;
+  bus->Zero();
+  *bytes_written = bus->frames() * parser_.bytes_per_frame();
+  return true;
+}
+
+void TestWavReader::SimulateAtEndOnce() {
+  ++num_simulate_at_end_requests_;
+}
+
 }  // namespace media