Adds AudioDevice factory for all audio clients in Chrome

content/renderer/media/audio_device_factory.cc

Index: content/renderer/media/audio_device_factory.cc
diff --git a/content/renderer/media/audio_device_factory.cc b/content/renderer/media/audio_device_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..555ebd631ae66d0f64b18f5499cd7af526aa3c90
--- /dev/null
+++ b/content/renderer/media/audio_device_factory.cc
@@ -0,0 +1,32 @@
+// 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 "content/renderer/media/audio_device_factory.h"
+
+#include "base/logging.h"
+#include "content/renderer/media/audio_device.h"
+
+namespace content {
+
+// static
+AudioDeviceFactory* AudioDeviceFactory::factory_ = NULL;
+
+// static
+media::AudioRendererSink* AudioDeviceFactory::Create() {
+  if (factory_) {
+    return factory_->CreateAudioDevice();
+  }
+  return new AudioDevice();
+}
+
+AudioDeviceFactory::AudioDeviceFactory() {
+  DCHECK(!factory_) << "Can't register two factories at once.";
+  factory_ = this;
+}
+
+AudioDeviceFactory::~AudioDeviceFactory() {
+  factory_ = NULL;
+}
+
+}  // namespace content