[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 a3d21da608e3c080a8977053cd470213fff29304..ec6c0beca3afc23b1f7eb58f4e709daebd3d4392 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 +12,18 @@ namespace base {
 class FilePath;
 }  // namespace base
 
+namespace fileapi {
+class AsyncFileUtil;
+class FileSystemContext;
+class FileSystemURL;
+class FileStreamWriter;
+class WatcherManager;
+}  // namespace fileapi
+
+namespace webkit_blob {
+class FileStreamReader;
+}  // namespace webkit_blob
+
 class DeviceMediaAsyncFileUtil;
 
 namespace chromeos {
@@ -36,6 +48,8 @@ class MTPFileSystemBackendDelegate : public FileSystemBackendDelegate {
       const fileapi::FileSystemURL& url,
       int64 offset,
       fileapi::FileSystemContext* context) OVERRIDE;
+  virtual fileapi::WatcherManager* GetWatcherManager(
+      const fileapi::FileSystemURL& url) OVERRIDE;
 
  private:
   scoped_ptr<DeviceMediaAsyncFileUtil> device_media_async_file_util_;