net: Move data reading functionalities from UploadElement to UploadElementReader

net/base/upload_data_stream.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_DATA_STREAM_H_
 #define NET_BASE_UPLOAD_DATA_STREAM_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_vector.h"
 #include "net/base/net_export.h"
 #include "net/base/upload_data.h"
 
 namespace net {
 
-class FileStream;
 class IOBuffer;
+class UploadElementReader;
 
 class NET_EXPORT UploadDataStream {
  public:
   explicit UploadDataStream(UploadData* upload_data);
   ~UploadDataStream();
 
   // Initializes the stream. This function must be called exactly once,
   // before calling any other method. It is not valid to call any method
   // (other than the destructor) if Init() returns a failure.
   //
@@ skipping 42 matching lines @@
   friend class SpdyHttpStreamSpdy2Test;
   friend class SpdyHttpStreamSpdy3Test;
   friend class SpdyNetworkTransactionSpdy2Test;
   friend class SpdyNetworkTransactionSpdy3Test;
 
   // These methods are provided only to be used by unit tests.
   static void ResetMergeChunks();
   static void set_merge_chunks(bool merge) { merge_chunks_ = merge; }
 
   scoped_refptr<UploadData> upload_data_;
+  ScopedVector<UploadElementReader> element_readers_;
 
   // Index of the current upload element (i.e. the element currently being
   // read). The index is used as a cursor to iterate over elements in
   // |upload_data_|.
   size_t element_index_;
 
   // Size and current read position within the upload data stream.
   uint64 total_size_;
   uint64 current_position_;
 
   // True if the initialization was successful.
   bool initialized_successfully_;
 
   // TODO(satish): Remove this once we have a better way to unit test POST
   // requests with chunked uploads.
   static bool merge_chunks_;
 
   DISALLOW_COPY_AND_ASSIGN(UploadDataStream);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_DATA_STREAM_H_