Add IPC interface for switching the audio output device for a given audio stream in the browser.

content/browser/media/media_internals.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 "content/browser/media/media_internals.h"
 
 #include "base/metrics/histogram.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ skipping 84 matching lines @@
   ~AudioLogImpl() override;
 
   void OnCreated(int component_id,
                  const media::AudioParameters& params,
                  const std::string& device_id) override;
   void OnStarted(int component_id) override;
   void OnStopped(int component_id) override;
   void OnClosed(int component_id) override;
   void OnError(int component_id) override;
   void OnSetVolume(int component_id, double volume) override;
+  void OnSwitchOutputDevice(int component_id,
+                            const std::string& device_id) override;
 
   // Called by MediaInternals to update the WebContents title for a stream.
   void SendWebContentsTitle(int component_id,
                             int render_process_id,
                             int render_frame_id);
 
  private:
   void SendSingleStringUpdate(int component_id,
                               const std::string& key,
                               const std::string& value);
@@ skipping 65 matching lines @@
 
 void AudioLogImpl::OnSetVolume(int component_id, double volume) {
   base::DictionaryValue dict;
   StoreComponentMetadata(component_id, &dict);
   dict.SetDouble("volume", volume);
   media_internals_->SendAudioLogUpdate(MediaInternals::UPDATE_IF_EXISTS,
                                        FormatCacheKey(component_id),
                                        kAudioLogUpdateFunction, &dict);
 }
 
+void AudioLogImpl::OnSwitchOutputDevice(int component_id,
+                                        const std::string& device_id) {
+  base::DictionaryValue dict;
+  StoreComponentMetadata(component_id, &dict);
+  dict.SetString("device_id", device_id);
+  media_internals_->SendAudioLogUpdate(MediaInternals::UPDATE_IF_EXISTS,
+                                       FormatCacheKey(component_id),
+                                       kAudioLogUpdateFunction, &dict);
+}
+
 void AudioLogImpl::SendWebContentsTitle(int component_id,
                                         int render_process_id,
                                         int render_frame_id) {
   scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
   StoreComponentMetadata(component_id, dict.get());
   SendWebContentsTitleHelper(FormatCacheKey(component_id), dict.Pass(),
                              render_process_id, render_frame_id);
 }
 
 std::string AudioLogImpl::FormatCacheKey(int component_id) {
@@ skipping 461 matching lines @@
       CHECK(
           audio_streams_cached_data_.GetDictionary(cache_key, &existing_dict));
       existing_dict->MergeDictionary(value);
     }
   }
 
   SendUpdate(SerializeUpdate(function, value));
 }
 
 }  // namespace content