[ew] Add basic classes.

chrome/browser/local_discovery/storage/privet_filesystem_backend.cc

Index: chrome/browser/local_discovery/storage/privet_filesystem_backend.cc
diff --git a/chrome/browser/local_discovery/storage/privet_filesystem_backend.cc b/chrome/browser/local_discovery/storage/privet_filesystem_backend.cc
index 70433cd101297a6cc9222d0d06b945a1af5c544e..124834a2a9a13228e26fc9aab40489364af64ccb 100644
--- a/chrome/browser/local_discovery/storage/privet_filesystem_backend.cc
+++ b/chrome/browser/local_discovery/storage/privet_filesystem_backend.cc
@@ -56,6 +56,11 @@ fileapi::AsyncFileUtil* PrivetFileSystemBackend::GetAsyncFileUtil(
   return async_util_.get();
 }
 
+fileapi::WatcherManager* PrivetFileSystemBackend::GetWatcherManager(
+    fileapi::FileSystemType type) {
+  return NULL;
+}
+
 fileapi::CopyOrMoveFileValidatorFactory*
 PrivetFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     fileapi::FileSystemType type, base::File::Error* error_code) {