Allow URLRequest::AppendChunkToUpload to take 0-byte final chunks.

net/url_request/url_request.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_URL_REQUEST_URL_REQUEST_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 285 matching lines @@
 
   // Sets the delegate of the request.  This value may be changed at any time,
   // and it is permissible for it to be null.
   void set_delegate(Delegate* delegate);
 
   // Indicates that the request body should be sent using chunked transfer
   // encoding. This method may only be called before Start() is called.
   void EnableChunkedUpload();
 
   // Appends the given bytes to the request's upload data to be sent
-  // immediately via chunked transfer encoding. When all data has been sent,
-  // call MarkEndOfChunks() to indicate the end of upload data.
+  // immediately via chunked transfer encoding. When all data has been added,
+  // set |is_last_chunk| to true to indicate the end of upload data.  All chunks
+  // but the last must have |bytes_len| > 0.
   //
   // This method may be called only after calling EnableChunkedUpload().
+  //
+  // Despite the name of this method, over-the-wire chunk boundaries will most
+  // likely not match the "chunks" appended with this function.
   void AppendChunkToUpload(const char* bytes,
                            int bytes_len,
                            bool is_last_chunk);
 
   // Sets the upload data.
   void set_upload(scoped_ptr<UploadDataStream> upload);
 
   // Gets the upload data.
   const UploadDataStream* get_upload() const;
 
@@ skipping 500 matching lines @@
 
   // The proxy server used for this request, if any.
   HostPortPair proxy_server_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_