Add support for default local address in IpcNetworkManager

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
index 4827d2ba42e79b3451abdb1247034eafcb7d3502..d53cc734cb91f3d2c096e5a093a8adeee4d8f666 100644
--- a/content/renderer/p2p/empty_network_manager.h
+++ b/content/renderer/p2p/empty_network_manager.h
@@ -10,6 +10,10 @@
 #include "content/common/content_export.h"
 #include "third_party/webrtc/base/network.h"
 
+namespace rtc {
+class IPAddress;
+}  // namespace rtc
+
 namespace content {
 
 // A NetworkManager implementation which handles the case where local address
@@ -19,13 +23,16 @@ 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 explicit EmptyNetworkManager(
+      rtc::NetworkManager* network_manager);
   CONTENT_EXPORT ~EmptyNetworkManager() override;
 
   // rtc::NetworkManager:
   void StartUpdating() override;
   void StopUpdating() override;
   void GetNetworks(NetworkList* networks) const override;
+  bool GetDefaultLocalAddress(int family,
+                              rtc::IPAddress* ipaddress) const override;
 
  private:
   void FireEvent();
@@ -36,6 +43,10 @@ class EmptyNetworkManager : public rtc::NetworkManagerBase {
   // Track whether StartUpdating() has been called before.
   bool updating_started_ = false;
 
+  // |network_manager_| is just a reference, owned by
+  // PeerConnectionDependencyFactory.
+  rtc::NetworkManager* network_manager_;
+
   base::WeakPtrFactory<EmptyNetworkManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EmptyNetworkManager);