[ew] Add basic classes.

chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h

Index: chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h
diff --git a/chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h b/chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h
index 292919465fbcc8434af5393c4b733c7219ce7914..06e751ad5fe74137dd0dce48cef9996052a6f895 100644
--- a/chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h
+++ b/chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h
@@ -12,6 +12,15 @@ namespace base {
 class FilePath;
 }  // namespace base
 
+namespace storage {
+class AsyncFileUtil;
+class FileSystemContext;
+class FileStreamReader;
+class FileSystemURL;
+class FileStreamWriter;
+class WatcherManager;
+}  // namespace storage
+
 class DeviceMediaAsyncFileUtil;
 
 namespace chromeos {
@@ -36,6 +45,8 @@ class MTPFileSystemBackendDelegate : public FileSystemBackendDelegate {
       const storage::FileSystemURL& url,
       int64 offset,
       storage::FileSystemContext* context) OVERRIDE;
+  virtual storage::WatcherManager* GetWatcherManager(
+      const storage::FileSystemURL& url) OVERRIDE;
 
  private:
   scoped_ptr<DeviceMediaAsyncFileUtil> device_media_async_file_util_;