AU: Make proxy resolution asynchronous.

libcurl_http_fetcher.h

 // Copyright (c) 2009 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__
 
 #include <map>
 #include <string>
 #include <curl/curl.h>
@@ skipping 73 matching lines @@
     force_connection_type_ = true;
     forced_expensive_connection_ = is_expensive;
   }
 
   void SetBuildType(bool is_official) {
     force_build_type_ = true;
     forced_official_build_ = is_official;
   }
 
  private:
+  // Callback for when proxy resolution has completed. This begins the
+  // transfer.
+  void ProxiesResolved();
+   
   // Asks libcurl for the http response code and stores it in the object.
   void GetHttpResponseCode();
 
   // Resumes a transfer where it left off. This will use the
   // HTTP Range: header to make a new connection from where the last
   // left off.
   virtual void ResumeTransfer(const std::string& url);
 
   // These two methods are for glib main loop callbacks. They are called
   // when either a file descriptor is ready for work or when a timer
@@ skipping 114 matching lines @@
   // We can't clean everything up while we're in a write callback, so
   // if we get a terminate request, queue it until we can handle it.
   bool terminate_requested_;
 
   DISALLOW_COPY_AND_ASSIGN(LibcurlHttpFetcher);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__