Implement STUN support for P2P Transport API.

content/renderer/p2p/host_address_request.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_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_
 #define CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/net_util.h"
 
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
 
 namespace content {
 
 class P2PSocketDispatcher;
 
+// P2PHostAddressRequest performs DNS hostname resolution. It's used
+// to resolve addresses of STUN and relay servers.
+//
+// TODO(sergeyu): Name of this class may be confusing. Rename it to
+// something else, e.g. P2PHostnameResolver.
 class P2PHostAddressRequest :
     public base::RefCountedThreadSafe<P2PHostAddressRequest>  {
  public:
   typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;
 
   P2PHostAddressRequest(P2PSocketDispatcher* dispatcher);
 
   // Sends host address request.
   void Request(const std::string& host_name,
                const DoneCallback& done_callback);
@@ skipping 31 matching lines @@
   // Accessed on the IPC thread only.
   int32 request_id_;
   bool registered_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PHostAddressRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_