Revert of Remove AudioTrackRenderer

talk/media/base/fakemediaengine.h

 /*
  * libjingle
  * Copyright 2004 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 290 matching lines @@
     return true;
   }
   virtual bool SetRemoteRenderer(uint32_t ssrc, AudioRenderer* renderer) {
     std::map<uint32_t, AudioRenderer*>::iterator it =
         remote_renderers_.find(ssrc);
     if (renderer) {
       if (it != remote_renderers_.end()) {
         ASSERT(it->second == renderer);
       } else {
         remote_renderers_.insert(std::make_pair(ssrc, renderer));
+        renderer->AddChannel(0);
       }
     } else {
       if (it != remote_renderers_.end()) {
+        it->second->RemoveChannel(0);
         remote_renderers_.erase(it);
       } else {
         return false;
       }
     }
     return true;
   }
 
   virtual bool GetActiveStreams(AudioInfo::StreamList* streams) { return true; }
   virtual int GetOutputLevel() { return 0; }
@@ skipping 49 matching lines @@
  private:
   struct OutputScaling {
     OutputScaling() : left(1.0), right(1.0) {}
     double left, right;
   };
 
   class VoiceChannelAudioSink : public AudioRenderer::Sink {
    public:
     explicit VoiceChannelAudioSink(AudioRenderer* renderer)
         : renderer_(renderer) {
+      renderer_->AddChannel(0);
       renderer_->SetSink(this);
     }
     virtual ~VoiceChannelAudioSink() {
       if (renderer_) {
+        renderer_->RemoveChannel(0);
         renderer_->SetSink(NULL);
       }
     }
     void OnData(const void* audio_data,
                 int bits_per_sample,
                 int sample_rate,
                 int number_of_channels,
                 size_t number_of_frames) override {}
     void OnClose() override { renderer_ = NULL; }
     AudioRenderer* renderer() const { return renderer_; }
@@ skipping 609 matching lines @@
 
  private:
   std::vector<FakeDataMediaChannel*> channels_;
   std::vector<DataCodec> data_codecs_;
   DataChannelType last_channel_type_;
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_BASE_FAKEMEDIAENGINE_H_