Isolated FS for media devices.

webkit/fileapi/media_device_map_service.h

Index: webkit/fileapi/media_device_map_service.h
diff --git a/webkit/fileapi/media_device_map_service.h b/webkit/fileapi/media_device_map_service.h
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+++ b/webkit/fileapi/media_device_map_service.h
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+// 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 WEBKIT_FILEAPI_MEDIA_DEVICE_MAP_SERVICE_H_
+#define WEBKIT_FILEAPI_MEDIA_DEVICE_MAP_SERVICE_H_
+
+#include <map>
+
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/singleton.h"
+#include "base/synchronization/lock.h"
+
+namespace fileapi {
+
+#if defined(OS_WIN)
+class MtpDeviceInterfaceWin;
+typedef class MtpDeviceInterfaceWin MediaDevice;
+#elif defined(OS_POSIX) && !defined(OS_MACOSX)
+class MtpDeviceInterfaceLinux;
+typedef class MtpDeviceInterfaceLinux MediaDevice;
+#endif
+
+// Helper class to manage MTP device interfaces.
+class MediaDeviceMapService {
+ public:
+  static MediaDeviceMapService* GetInstance();
+
+  void AddMediaDevice(const FilePath::StringType& device_id);
+
+  // TODO(kmadhusu): Implement a media device detached observer and remove the
+  // media device from the map.
+  void RemoveMediaDevice(const FilePath::StringType& device_id);
+  bool GetMediaDevice(const FilePath::StringType& device_id,
+                      scoped_refptr<MediaDevice>* device);
+
+ private:
+  MediaDeviceMapService();
+  ~MediaDeviceMapService();
+
+  friend struct DefaultSingletonTraits<MediaDeviceMapService>;
+
+  typedef scoped_refptr<MediaDevice> MediaDeviceRefPtr;
+  typedef std::map<FilePath::StringType, MediaDeviceRefPtr> MediaDeviceMap;
+
+  base::Lock media_device_map_lock_;
+
+  // Store a map of attached mtp devices.
+  // Key: Device id.
+  // Value: MtpDeviceInterface.
+  MediaDeviceMap media_device_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaDeviceMapService);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_MEDIA_DEVICE_MAP_SERVICE_H_