net: Make UploadDataStream::Read() asynchronous

net/http/http_stream_parser.h

 // Copyright (c) 2012 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 NET_HTTP_HTTP_STREAM_PARSER_H_
 #define NET_HTTP_HTTP_STREAM_PARSER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 40 matching lines @@
                   HttpResponseInfo* response,
                   const CompletionCallback& callback);
 
   int ReadResponseHeaders(const CompletionCallback& callback);
 
   int ReadResponseBody(IOBuffer* buf, int buf_len,
                        const CompletionCallback& callback);
 
   void Close(bool not_reusable);
 
+  // Returns the progress of uploading. When data is chunked, size is set to
+  // zero, but position will not be.
   UploadProgress GetUploadProgress() const;
 
   HttpResponseInfo* GetResponseInfo();
 
   bool IsResponseBodyComplete() const;
 
   bool CanFindEndOfResponse() const;
 
   bool IsMoreDataBuffered() const;
 
@@ skipping 162 matching lines @@
   scoped_refptr<SeekableIOBuffer> request_body_buf_;
   size_t chunk_length_without_encoding_;
   bool sent_last_chunk_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamParser);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_PARSER_H_