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..fcc02f4f015a122d9d04b3f3829d7468a678e29c
--- /dev/null
+++ b/content/renderer/p2p/empty_network_manager.h
@@ -0,0 +1,56 @@
+// 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.
+
+// 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.
+
+#ifndef CONTENT_RENDERER_P2P_EMPTY_NETWORK_MANAGER_H_
+#define CONTENT_RENDERER_P2P_EMPTY_NETWORK_MANAGER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "base/time/time.h"
+#include "content/common/content_export.h"
+#include "third_party/webrtc/base/network.h"
+#include "third_party/webrtc/base/sigslot.h"
+#include "url/gurl.h"
+
+namespace rtc {
+class NetworkManager;
+}  // namespace rtc
+
+namespace content {
+
+class EmptyNetworkManager : public rtc::NetworkManagerBase,
+                            public base::SupportsWeakPtr<EmptyNetworkManager>,

[Sergey Ulanov, 2015/09/21 22:12:58]

It's preferrable to use WeakPtrFactory instead of inheriting from
SupportsWeakPtr.

[guoweis_left_chromium, 2015/09/22 17:56:56]

Done.

+                            public sigslot::has_slots<> {

[Sergey Ulanov, 2015/09/21 22:12:58]

Don't need has_slots<>

[guoweis_left_chromium, 2015/09/22 17:56:56]

Done.

+ public:
+  // This class is created by WebRTC's signaling thread but used by WebRTC's
+  // worker thread |task_runner|.
+  CONTENT_EXPORT EmptyNetworkManager(

[Sergey Ulanov, 2015/09/21 22:12:58]

Mark the whole class as CONTENT_EXPORT?

[guoweis_left_chromium, 2015/09/22 17:56:56]

Done.

+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
+
+  CONTENT_EXPORT ~EmptyNetworkManager() override;
+
+  // rtc::NetworkManager:
+  void StartUpdating() override;
+  void StopUpdating() override;
+  void GetNetworks(NetworkList* networks) const override;
+
+ private:
+  void FireEvent(bool first_time);
+  void SendNetworksChangedSignal();
+
+  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+  // Track how long it takes for client to receive SignalNetworksChanged.
+  base::TimeTicks start_updating_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(EmptyNetworkManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_P2P_EMPTY_NETWORK_MANAGER_H_