Flesh out URLLoader's download_to_file function....

chrome/browser/renderer_host/async_resource_handler.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 20 matching lines @@
                            ResourceResponse* response, bool* defer);
   bool OnResponseStarted(int request_id, ResourceResponse* response);
   bool OnWillStart(int request_id, const GURL& url, bool* defer);
   bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
                   int min_size);
   bool OnReadCompleted(int request_id, int* bytes_read);
   bool OnResponseCompleted(int request_id,
                            const URLRequestStatus& status,
                            const std::string& security_info);
   void OnRequestClosed();
+  void OnDataDownloaded(int request_id, int bytes_downloaded);
 
   static void GlobalCleanup();
 
  private:
   ~AsyncResourceHandler();
 
   scoped_refptr<SharedIOBuffer> read_buffer_;
   ResourceDispatcherHost::Receiver* receiver_;
   int process_id_;
   int routing_id_;
   base::ProcessHandle process_handle_;
   ResourceDispatcherHost* rdh_;
 
   // |next_buffer_size_| is the size of the buffer to be allocated on the next
   // OnWillRead() call.  We exponentially grow the size of the buffer allocated
   // when our owner fills our buffers. On the first OnWillRead() call, we
   // allocate a buffer of 32k and double it in OnReadCompleted() if the buffer
   // was filled, up to a maximum size of 512k.
   int next_buffer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_