Add a new audio extension event OnLevelChanged.

extensions/browser/api/audio/audio_api.cc

 // Copyright (c) 2013 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 "extensions/browser/api/audio/audio_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/values.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/common/api/audio.h"
@@ skipping 27 matching lines @@
 
 void AudioAPI::OnDeviceChanged() {
   if (browser_context_ && EventRouter::Get(browser_context_)) {
     scoped_ptr<Event> event(new Event(
         audio::OnDeviceChanged::kEventName,
         scoped_ptr<base::ListValue>(new base::ListValue())));
     EventRouter::Get(browser_context_)->BroadcastEvent(event.Pass());
   }
 }
 
+void AudioAPI::OnOutputNodeVolumeChanged(const std::string& id, double volume) {
+  if (browser_context_ && EventRouter::Get(browser_context_)) {
+    scoped_ptr<base::ListValue> args =
+        audio::OnOutputNodeVolumeChanged::Create(id, volume);
+    scoped_ptr<Event> event(
+        new Event(audio::OnOutputNodeVolumeChanged::kEventName, args.Pass()));
+    EventRouter::Get(browser_context_)->BroadcastEvent(event.Pass());
+  }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 bool AudioGetInfoFunction::RunAsync() {
   AudioService* service =
       AudioAPI::GetFactoryInstance()->Get(browser_context())->GetService();
   DCHECK(service);
   service->StartGetInfo(base::Bind(&AudioGetInfoFunction::OnGetInfoCompleted,
                                    this));
   return true;
 }
@@ skipping 42 matching lines @@
 
   if (!service->SetDeviceProperties(params->id,
                                     params->properties.is_muted,
                                     volume_value,
                                     gain_value))
     return false;
   else
     return true;
 }
 
+///////////////////////////////////////////////////////////////////////////////
+
+bool AudioGetDeviceInfoFunction::RunAsync() {
+  AudioService* service =
+      AudioAPI::GetFactoryInstance()->Get(browser_context())->GetService();
+  DCHECK(service);
+  service->StartGetDeviceInfo(
+      base::Bind(&AudioGetDeviceInfoFunction::OnGetDeviceInfoCompleted, this));
+  return true;
+}
+
+void AudioGetDeviceInfoFunction::OnGetDeviceInfoCompleted(
+    const DevicesInfo& devices_info,
+    bool success) {
+  if (success)
+    results_ = audio::GetDeviceInfo::Results::Create(devices_info);
+  else
+    SetError("Error occurred when querying audio device information.");
+  SendResponse(success);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 }  // namespace extensions