Add a new finch experiment to control the system buffer size.

content/browser/renderer_host/p2p/socket_host_udp.h

 // Copyright (c) 2011 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_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_UDP_H_
 #define CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_UDP_H_
 
 #include <deque>
 #include <set>
 #include <vector>
@@ skipping 45 matching lines @@
     ~PendingPacket();
     net::IPEndPoint to;
     scoped_refptr<net::IOBuffer> data;
     int size;
     rtc::PacketOptions packet_options;
     uint64 id;
   };
 
   void OnError();
 
+  void SetSendBufferSize();
+
   void DoRead();
   void OnRecv(int result);
   void HandleReadResult(int result);
 
   void DoSend(const PendingPacket& packet);
-  void OnSend(uint64 packet_id, int result);
-  void HandleSendResult(uint64 packet_id, int result);
+  void OnSend(uint64 packet_id, uint64 tick_received, int result);
+  void HandleSendResult(uint64 packet_id, uint64 tick_received, int result);
 
   scoped_ptr<net::DatagramServerSocket> socket_;
   scoped_refptr<net::IOBuffer> recv_buffer_;
   net::IPEndPoint recv_address_;
 
   std::deque<PendingPacket> send_queue_;
   bool send_pending_;
   net::DiffServCodePoint last_dscp_;
 
   // Set of peer for which we have received STUN binding request or
   // response or relay allocation request or response.
   ConnectedPeerSet connected_peers_;
   P2PMessageThrottler* throttler_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PSocketHostUdp);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_UDP_H_