Move MTPDeviceDelegateImplLinux worker classes to its own files.

chrome/browser/media_gallery/linux/mtp_device_object_enumerator.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 CHROME_BROWSER_MEDIA_GALLERY_LINUX_MTP_DEVICE_OBJECT_ENUMERATOR_H_
+#define CHROME_BROWSER_MEDIA_GALLERY_LINUX_MTP_DEVICE_OBJECT_ENUMERATOR_H_
+
+#include <vector>
+
+#include "base/file_path.h"
+#include "base/time.h"
+#include "chrome/browser/media_transfer_protocol/mtp_file_entry.pb.h"
+#include "webkit/fileapi/file_system_file_util.h"
+
+namespace chrome {
+
+typedef std::vector<MtpFileEntry> MtpFileEntries;
+
+// Used to enumerate top-level files of an media file system.
+class MTPDeviceObjectEnumerator
+    : public fileapi::FileSystemFileUtil::AbstractFileEnumerator {
+ public:
+  explicit MTPDeviceObjectEnumerator(const MtpFileEntries& entries);
+
+  virtual ~MTPDeviceObjectEnumerator();
+
+  // AbstractFileEnumerator:
+  virtual FilePath Next() OVERRIDE;
+  virtual int64 Size() OVERRIDE;
+  virtual bool IsDirectory() OVERRIDE;
+  virtual base::Time LastModifiedTime() OVERRIDE;
+
+ private:
+  // List of directory file entries information.
+  const MtpFileEntries file_entries_;
+
+  // Iterator to access the individual file entries.
+  MtpFileEntries::const_iterator file_entry_iter_;
+
+  // Stores the current file information.
+  MtpFileEntry current_file_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(MTPDeviceObjectEnumerator);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_MEDIA_GALLERY_LINUX_MTP_DEVICE_OBJECT_ENUMERATOR_H_