Check media permissions (mic/camera) before exposing local addresses to WebRTC.

content/renderer/p2p/empty_network_manager.h

Index: content/renderer/p2p/empty_network_manager.h
diff --git a/content/renderer/p2p/empty_network_manager.h b/content/renderer/p2p/empty_network_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..4827d2ba42e79b3451abdb1247034eafcb7d3502
--- /dev/null
+++ b/content/renderer/p2p/empty_network_manager.h
@@ -0,0 +1,46 @@
+// Copyright 2015 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_RENDERER_P2P_EMPTY_NETWORK_MANAGER_H_
+#define CONTENT_RENDERER_P2P_EMPTY_NETWORK_MANAGER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "content/common/content_export.h"
+#include "third_party/webrtc/base/network.h"
+
+namespace content {
+
+// A NetworkManager implementation which handles the case where local address
+// enumeration is not requested and just returns empty network lists. This class
+// is not thread safe and should only be used by WebRTC's worker thread.
+class EmptyNetworkManager : public rtc::NetworkManagerBase {
+ public:
+  // This class is created by WebRTC's signaling thread but used by WebRTC's
+  // worker thread |task_runner|.
+  CONTENT_EXPORT EmptyNetworkManager();
+  CONTENT_EXPORT ~EmptyNetworkManager() override;
+
+  // rtc::NetworkManager:
+  void StartUpdating() override;
+  void StopUpdating() override;
+  void GetNetworks(NetworkList* networks) const override;
+
+ private:
+  void FireEvent();
+  void SendNetworksChangedSignal();
+
+  base::ThreadChecker thread_checker_;
+
+  // Track whether StartUpdating() has been called before.
+  bool updating_started_ = false;
+
+  base::WeakPtrFactory<EmptyNetworkManager> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(EmptyNetworkManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_P2P_EMPTY_NETWORK_MANAGER_H_