Add a ref counted audio bus.

media/base/audio_bus.cc

 // Copyright (c) 2012 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 "media/base/audio_bus.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/limits.h"
@@ skipping 322 matching lines @@
   }
 }
 
 void AudioBus::SwapChannels(int a, int b) {
   DCHECK(a < channels() && a >= 0);
   DCHECK(b < channels() && b >= 0);
   DCHECK_NE(a, b);
   std::swap(channel_data_[a], channel_data_[b]);
 }
 
+scoped_refptr<AudioBusRefCounted> AudioBusRefCounted::Create(
+    int channels, int frames) {
+  return scoped_refptr<AudioBusRefCounted>(
+      new AudioBusRefCounted(channels, frames));
+}
+
+AudioBusRefCounted::AudioBusRefCounted(int channels, int frames)
+    : AudioBus(channels, frames) {}
+
+AudioBusRefCounted::~AudioBusRefCounted() {}
+
 }  // namespace media