[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 3b8b146b9f66f0c7c43489c065f04e71520e954c..41340fe0840c5531e383642f53e1db7533a31ea7 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend.h
+++ b/chrome/browser/chromeos/fileapi/file_system_backend.h
@@ -19,6 +19,7 @@ namespace fileapi {
 class CopyOrMoveFileValidatorFactory;
 class ExternalMountPoints;
 class FileSystemURL;
+class WatcherManager;
 }  // namespace fileapi
 
 namespace chromeos {
@@ -93,6 +94,8 @@ class FileSystemBackend : public fileapi::ExternalFileSystemBackend {
                           const OpenFileSystemCallback& callback) OVERRIDE;
   virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
       fileapi::FileSystemType type) OVERRIDE;
+  virtual fileapi::WatcherManager* GetWatcherManager(
+      fileapi::FileSystemType type) OVERRIDE;
   virtual fileapi::CopyOrMoveFileValidatorFactory*
       GetCopyOrMoveFileValidatorFactory(
           fileapi::FileSystemType type,