Connecting webrtc-internals WebUI frontend with the backend

chrome/browser/media/chrome_webrtc_internals.h

Index: chrome/browser/media/chrome_webrtc_internals.h
diff --git a/chrome/browser/media/chrome_webrtc_internals.h b/chrome/browser/media/chrome_webrtc_internals.h
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+// 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 CHROME_BROWSER_MEDIA_CHROME_WEBRTC_INTERNALS_H_
+#define CHROME_BROWSER_MEDIA_CHROME_WEBRTC_INTERNALS_H_
+
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "base/process.h"
+#include "base/values.h"
+#include "content/public/browser/webrtc_internals.h"
+
+class WebRTCInternalsUIObserver;
+
+// This is a singleton class running in the browser UI thread.
+// It collects peer connection infomation from the renderers,
+// forwards the data to WebRTCInternalsUIObserver and
+// sends data collecting commands to the renderers.
+class ChromeWebRTCInternals : public content::WebRTCInternals {
+ public:
+  static ChromeWebRTCInternals* GetInstance();
+
+  virtual void AddPeerConnection(base::ProcessId pid,
+                                 int lid,
+                                 const std::string& url,
+                                 const std::string& servers,
+                                 const std::string& constraints) OVERRIDE;
+  virtual void RemovePeerConnection(base::ProcessId pid, int lid) OVERRIDE;
+
+  // Methods for adding or removing WebRTCInternalsUIObserver.
+  void AddObserver(WebRTCInternalsUIObserver *observer);
+  void RemoveObserver(WebRTCInternalsUIObserver *observer);
+
+ private:
+  friend struct DefaultSingletonTraits<ChromeWebRTCInternals>;
+
+  ChromeWebRTCInternals();
+  virtual ~ChromeWebRTCInternals();
+
+  void SendUpdate(const std::string& command, base::Value* value);
+
+  ObserverList<WebRTCInternalsUIObserver> observers_;
+  base::ListValue peer_connection_data_;
+};
+
+#endif  // CHROME_BROWSER_MEDIA_CHROME_WEBRTC_INTERNALS_H_