[ew] Add basic classes.

chrome/browser/chromeos/fileapi/file_system_backend.h

Index: chrome/browser/chromeos/fileapi/file_system_backend.h
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend.h b/chrome/browser/chromeos/fileapi/file_system_backend.h
index a8109bfe277c5dd2ed0b663c0926f8e59f0d2b6b..8b5d50afde7a9a272dba373edbb4d3aa7e48bfae 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend.h
+++ b/chrome/browser/chromeos/fileapi/file_system_backend.h
@@ -19,6 +19,7 @@ namespace storage {
 class CopyOrMoveFileValidatorFactory;
 class ExternalMountPoints;
 class FileSystemURL;
+class WatcherManager;
 }  // namespace storage
 
 namespace chromeos {
@@ -93,6 +94,8 @@ class FileSystemBackend : public storage::ExternalFileSystemBackend {
                           const OpenFileSystemCallback& callback) OVERRIDE;
   virtual storage::AsyncFileUtil* GetAsyncFileUtil(
       storage::FileSystemType type) OVERRIDE;
+  virtual storage::WatcherManager* GetWatcherManager(
+      storage::FileSystemType type) OVERRIDE;
   virtual storage::CopyOrMoveFileValidatorFactory*
       GetCopyOrMoveFileValidatorFactory(storage::FileSystemType type,
                                         base::File::Error* error_code) OVERRIDE;