Connecting webrtc-internals WebUI frontend with the backend

content/browser/media/webrtc_internals.h

-// 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.
-
-#ifndef CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_H_
-#define CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_H_
-
-#include "base/memory/singleton.h"
-#include "base/observer_list.h"
-#include "base/process.h"
-#include "base/values.h"
-#include "content/common/content_export.h"
-
-struct PeerConnectionInfo;
-
-namespace content {
-
-class WebRTCInternalsUIObserver;
-
-// This is a singleton class running in the browser process.
-// It collects peer connection infomation from the renderers,
-// forwards the data to WebRTCInternalsUIObserver and
-// sends data collecting commands to the renderers.
-class CONTENT_EXPORT WebRTCInternals {
- public:
-  static WebRTCInternals* GetInstance();
-
-  // Methods called when peer connection status changes.
-  void AddPeerConnection(base::ProcessId pid, const PeerConnectionInfo& info);
-  void RemovePeerConnection(base::ProcessId pid, int lid);
-
-  // Methods for adding or removing WebRTCInternalsUIObserver.
-  void AddObserver(WebRTCInternalsUIObserver *observer);
-  void RemoveObserver(WebRTCInternalsUIObserver *observer);
-
- private:
-  friend struct DefaultSingletonTraits<WebRTCInternals>;
-
-  WebRTCInternals();
-  virtual ~WebRTCInternals();
-
-  // Send updates to observers on UI thread.
-  void SendUpdate(const std::string& command, base::Value* value);
-
-  // Only the IO thread should access these fields.
-  ObserverList<WebRTCInternalsUIObserver> observers_;
-  base::ListValue peer_connection_data_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_H_