Add a Preference to allow WebRTC only bind to "any address" (all 0s)

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
index fb09fafb11beb8b2aff5c3db0ccc1334ceaa1e9f..4554ad2d1e71f6ce4d79006effb472370c774b07 100644
--- a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
@@ -114,14 +114,14 @@ void HarmonizeConstraintsAndEffects(RTCMediaConstraints* constraints,
 
 class P2PPortAllocatorFactory : public webrtc::PortAllocatorFactoryInterface {
  public:
-  P2PPortAllocatorFactory(
-      P2PSocketDispatcher* socket_dispatcher,
-      rtc::NetworkManager* network_manager,
-      rtc::PacketSocketFactory* socket_factory)
+  P2PPortAllocatorFactory(P2PSocketDispatcher* socket_dispatcher,
+                          rtc::NetworkManager* network_manager,
+                          rtc::PacketSocketFactory* socket_factory,
+                          bool disable_multiple_routes)
       : socket_dispatcher_(socket_dispatcher),
         network_manager_(network_manager),
-        socket_factory_(socket_factory) {
-  }
+        socket_factory_(socket_factory),
+        disable_multiple_routes_(disable_multiple_routes) {}
 
   cricket::PortAllocator* CreatePortAllocator(
       const std::vector<StunConfiguration>& stun_servers,
@@ -147,6 +147,7 @@ class P2PPortAllocatorFactory : public webrtc::PortAllocatorFactoryInterface {
           turn_configurations[i].server.hostname(),
           turn_configurations[i].server.port()));
     }
+    config.disable_multiple_routes = disable_multiple_routes_;
 
     return new P2PPortAllocator(
         socket_dispatcher_.get(), network_manager_, socket_factory_, config);
@@ -161,6 +162,9 @@ class P2PPortAllocatorFactory : public webrtc::PortAllocatorFactoryInterface {
   // PeerConnectionDependencyFactory.
   rtc::NetworkManager* network_manager_;
   rtc::PacketSocketFactory* socket_factory_;
+
+  // When false, individual NICs will be bound for address discovery phase.
+  bool disable_multiple_routes_;
 };
 
 PeerConnectionDependencyFactory::PeerConnectionDependencyFactory(
@@ -170,7 +174,8 @@ PeerConnectionDependencyFactory::PeerConnectionDependencyFactory(
       signaling_thread_(NULL),
       worker_thread_(NULL),
       chrome_signaling_thread_("Chrome_libJingle_Signaling"),
-      chrome_worker_thread_("Chrome_libJingle_WorkerThread") {
+      chrome_worker_thread_("Chrome_libJingle_WorkerThread"),
+      disable_multiple_routes_(false) {
 }
 
 PeerConnectionDependencyFactory::~PeerConnectionDependencyFactory() {
@@ -395,10 +400,9 @@ PeerConnectionDependencyFactory::CreatePeerConnection(
     return NULL;
 
   scoped_refptr<P2PPortAllocatorFactory> pa_factory =
-        new rtc::RefCountedObject<P2PPortAllocatorFactory>(
-            p2p_socket_dispatcher_.get(),
-            network_manager_,
-            socket_factory_.get());
+      new rtc::RefCountedObject<P2PPortAllocatorFactory>(
+          p2p_socket_dispatcher_.get(), network_manager_, socket_factory_.get(),
+          disable_multiple_routes_);
 
   PeerConnectionIdentityService* identity_service =
       new PeerConnectionIdentityService(