Move MTPDeviceDelegateImplLinux worker classes to its own files.

chrome/browser/media_gallery/mtp_device_delegate_impl_linux.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_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
-#define CHROME_BROWSER_MEDIA_GALLERY_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/platform_file.h"
-#include "base/synchronization/waitable_event.h"
-#include "webkit/fileapi/file_system_file_util.h"
-#include "webkit/fileapi/media/mtp_device_delegate.h"
-
-class FilePath;
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace chrome {
-
-// This class communicates with the MTP storage to complete the isolated file
-// system operations. This class contains platform specific code to communicate
-// with the attached MTP storage. Instantiate this class per MTP storage. This
-// object is constructed on the UI thread. This object is operated and
-// destructed on the sequenced task runner thread. ScopedMTPDeviceMapEntry class
-// manages the lifetime of this object via MTPDeviceMapService class. This class
-// supports weak pointers because the base class supports weak pointers.
-class MTPDeviceDelegateImplLinux : public fileapi::MTPDeviceDelegate {
- public:
-  // Should only be called by ScopedMTPDeviceMapEntry. Use
-  // GetAsWeakPtrOnIOThread() to get a weak pointer instance of this class.
-  // Defer the device initializations until the first file operation request.
-  // Do all the initializations in LazyInit() function.
-  explicit MTPDeviceDelegateImplLinux(const std::string& device_location);
-
-  // MTPDeviceDelegate:
-  virtual base::PlatformFileError GetFileInfo(
-      const FilePath& file_path,
-      base::PlatformFileInfo* file_info) OVERRIDE;
-  virtual scoped_ptr<fileapi::FileSystemFileUtil::AbstractFileEnumerator>
-      CreateFileEnumerator(const FilePath& root,
-                           bool recursive) OVERRIDE;
-  virtual base::PlatformFileError CreateSnapshotFile(
-      const FilePath& device_file_path,
-      const FilePath& local_path,
-      base::PlatformFileInfo* file_info) OVERRIDE;
-  virtual base::SequencedTaskRunner* GetMediaTaskRunner() OVERRIDE;
-  virtual void CancelPendingTasksAndDeleteDelegate() OVERRIDE;
-  virtual base::WeakPtr<fileapi::MTPDeviceDelegate> GetAsWeakPtrOnIOThread()
-      OVERRIDE;
-
- private:
-  // Destructed via DeleteDelegateOnTaskRunner(). Do all the clean up in
-  // DeleteDelegateOnTaskRunner().
-  virtual ~MTPDeviceDelegateImplLinux();
-
-  // Opens the device for communication. This function is called on
-  // |media_task_runner_|. Returns true if the device is ready for
-  // communication, else false.
-  bool LazyInit();
-
-  // Deletes the delegate on the task runner thread. Called by
-  // CancelPendingTasksAndDeleteDelegate(). Performs clean up that needs to
-  // happen on |media_task_runner_|.
-  void DeleteDelegateOnTaskRunner();
-
-  // Stores the registered file system device path value. This path does not
-  // correspond to a real device path (E.g.: "/usb:2,2:81282").
-  const std::string device_path_;
-
-  // Stores the device handle returned by
-  // MediaTransferProtocolManager::OpenStorage().
-  std::string device_handle_;
-
-  // Stores a reference to worker pool thread. All requests and response of file
-  // operations are posted on |media_task_runner_|.
-  scoped_refptr<base::SequencedTaskRunner> media_task_runner_;
-
-  // |media_task_runner_| can wait on this event until the requested task is
-  // complete.
-  base::WaitableEvent on_task_completed_event_;
-
-  // Used to notify |media_task_runner_| pending tasks about the shutdown
-  // sequence. Signaled on the IO thread.
-  base::WaitableEvent on_shutdown_event_;
-
-  DISALLOW_COPY_AND_ASSIGN(MTPDeviceDelegateImplLinux);
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_MEDIA_GALLERY_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_