Send notification about outgoing p2p packets from browser to renderer.

content/browser/renderer_host/p2p/socket_host_udp.h

Index: content/browser/renderer_host/p2p/socket_host_udp.h
diff --git a/content/browser/renderer_host/p2p/socket_host_udp.h b/content/browser/renderer_host/p2p/socket_host_udp.h
index 710f743f257497a73589a545232da31c9c887e00..425b9dd8c1eba22b62eb4a129343065eefc8a8ab 100644
--- a/content/browser/renderer_host/p2p/socket_host_udp.h
+++ b/content/browser/renderer_host/p2p/socket_host_udp.h
@@ -48,9 +48,11 @@ class CONTENT_EXPORT P2PSocketHostUdp : public P2PSocketHost {
   };
 
   void OnError();
+
   void DoRead();
   void DoSend(const PendingPacket& packet);
   void DidCompleteRead(int result);
+  void DidCompleteSend(int result);
 
   // Callbacks for RecvFrom() and SendTo().
   void OnRecv(int result);
@@ -61,7 +63,6 @@ class CONTENT_EXPORT P2PSocketHostUdp : public P2PSocketHost {
   net::IPEndPoint recv_address_;
 
   std::deque<PendingPacket> send_queue_;
-  int send_queue_bytes_;
   bool send_pending_;
 
   // Set of peer for which we have received STUN binding request or