Create fileapi/ subdirectory under c/b/cros/drive.

chrome/browser/chromeos/drive/webkit_file_stream_reader_impl.h

-// Copyright 2013 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 CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_READER_IMPL_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_READER_IMPL_H_
-
-#include "base/basictypes.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/time/time.h"
-#include "chrome/browser/chromeos/drive/drive_file_stream_reader.h"
-#include "net/base/completion_callback.h"
-#include "webkit/browser/blob/file_stream_reader.h"
-
-namespace base {
-class SequencedTaskRunner;
-}  // namespace base
-
-namespace drive {
-
-class ResourceEntry;
-
-namespace internal {
-
-// The implementation of webkit_blob::FileStreamReader for drive file system.
-// webkit_blob::FileStreamReader does not provide a way for explicit
-// initialization, hence the initialization of this class will be done lazily.
-// Note that when crbug.com/225339 is resolved, this class will be also
-// initialized explicitly.
-class WebkitFileStreamReaderImpl : public webkit_blob::FileStreamReader {
- public:
-  WebkitFileStreamReaderImpl(
-      const DriveFileStreamReader::FileSystemGetter& file_system_getter,
-      base::SequencedTaskRunner* file_task_runner,
-      const base::FilePath& drive_file_path,
-      int64 offset,
-      const base::Time& expected_modification_time);
-  virtual ~WebkitFileStreamReaderImpl();
-
-  // webkit_blob::FileStreamReader override.
-  virtual int Read(net::IOBuffer* buffer,
-                   int buffer_length,
-                   const net::CompletionCallback& callback) OVERRIDE;
-  virtual int64 GetLength(const net::Int64CompletionCallback& callback)
-      OVERRIDE;
-
- private:
-  // Called upon the initialization completion of |stream_reader_|.
-  // Processes the result of the initialization with checking last
-  // modified time, and calls |callback| with net::Error code as its result.
-  void OnStreamReaderInitialized(
-      const net::CompletionCallback& callback,
-      int error,
-      scoped_ptr<ResourceEntry> entry);
-
-  // Part of Read(). Called after all the initialization process is completed.
-  void ReadAfterStreamReaderInitialized(
-      scoped_refptr<net::IOBuffer> buffer,
-      int buffer_length,
-      const net::CompletionCallback& callback,
-      int initialization_result);
-
-  // Part of GetLength(). Called after all the initialization process is
-  // completed.
-  void GetLengthAfterStreamReaderInitialized(
-      const net::Int64CompletionCallback& callback,
-      int initialization_result);
-
-  scoped_ptr<DriveFileStreamReader> stream_reader_;
-  const base::FilePath drive_file_path_;
-  const int64 offset_;
-  const base::Time expected_modification_time_;
-
-  // This is available only after initialize is done.
-  int64 file_size_;
-
-  // This should remain the last member so it'll be destroyed first and
-  // invalidate its weak pointers before other members are destroyed.
-  base::WeakPtrFactory<WebkitFileStreamReaderImpl> weak_ptr_factory_;
-  DISALLOW_COPY_AND_ASSIGN(WebkitFileStreamReaderImpl);
-};
-
-}  // namespace internal
-}  // namespace drive
-
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_READER_IMPL_H_