Revert 244857 "net: Remove classes which were used only by Chrom..."

trunk/src/net/base/upload_file_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_FILE_ELEMENT_READER_H_
 #define NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
@@ skipping 88 matching lines @@
   const uint64 range_length_;
   const base::Time expected_modification_time_;
   ScopedFileStreamPtr file_stream_;
   uint64 content_length_;
   uint64 bytes_remaining_;
   base::WeakPtrFactory<UploadFileElementReader> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UploadFileElementReader);
 };
 
+// An UploadElementReader implementation for file which performs file operation
+// synchronously.
+// Use this class only if the thread is IO allowed.
+class NET_EXPORT UploadFileElementReaderSync : public UploadElementReader {
+ public:
+  UploadFileElementReaderSync(const base::FilePath& path,
+                              uint64 range_offset,
+                              uint64 range_length,
+                              const base::Time& expected_modification_time);
+  virtual ~UploadFileElementReaderSync();
+
+  // UploadElementReader overrides:
+  virtual int Init(const CompletionCallback& callback) OVERRIDE;
+  virtual uint64 GetContentLength() const OVERRIDE;
+  virtual uint64 BytesRemaining() const OVERRIDE;
+  virtual int Read(IOBuffer* buf,
+                   int buf_length,
+                   const CompletionCallback& callback) OVERRIDE;
+
+ private:
+  const base::FilePath path_;
+  const uint64 range_offset_;
+  const uint64 range_length_;
+  const base::Time expected_modification_time_;
+  scoped_ptr<FileStream> file_stream_;
+  uint64 content_length_;
+  uint64 bytes_remaining_;
+
+  DISALLOW_COPY_AND_ASSIGN(UploadFileElementReaderSync);
+};
+
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_