net: Move ownership of UploadDataStream from URLRequestHttpJob to URLRequest

net/base/upload_element_reader.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_BASE_UPLOAD_ELEMENT_READER_H_
 #define NET_BASE_UPLOAD_ELEMENT_READER_H_
 
 #include "base/basictypes.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 class IOBuffer;
+class UploadBytesElementReader;
 class UploadElement;
+class UploadFileElementReader;
 
 // An interface to read an upload data element.
 class NET_EXPORT UploadElementReader {
  public:
   UploadElementReader() {}
   virtual ~UploadElementReader() {}
 
   // Creates an appropriate UploadElementReader instance for the given element.
   static UploadElementReader* Create(const UploadElement& element);
 
+  // Returns this instance's pointer as UploadBytesElementReader when possible,
+  // otherwise returns NULL.
+  virtual const UploadBytesElementReader* AsBytesReader() const;
+
+  // Returns this instance's pointer as UploadFileElementReader when possible,
+  // otherwise returns NULL.
+  virtual const UploadFileElementReader* AsFileReader() const;
+
   // Initializes the instance synchronously when possible, otherwise does
   // initialization aynschronously, returns ERR_IO_PENDING and runs callback.
   // Calling this method again after a Init() success results in resetting the
   // state.
   virtual int Init(const CompletionCallback& callback) = 0;
 
   // Initializes the instance always synchronously.
   // Use this method only if the thread is IO allowed or the data is in-memory.
   virtual int InitSync();
 
@@ skipping 21 matching lines @@
   // Use this method only if the thread is IO allowed or the data is in-memory.
   virtual int ReadSync(IOBuffer* buf, int buf_length);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(UploadElementReader);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_ELEMENT_READER_H_