drive: Call OnDirectoryChanged from EntryRevertPerformer

chrome/browser/chromeos/drive/sync/entry_revert_performer.h

Index: chrome/browser/chromeos/drive/sync/entry_revert_performer.h
diff --git a/chrome/browser/chromeos/drive/sync/entry_revert_performer.h b/chrome/browser/chromeos/drive/sync/entry_revert_performer.h
index 8ea5694628d4bec38b39a3d7f3a1c06a87b6e990..43fc70aa454df95ac7dcf74cae91416ed06faf65 100644
--- a/chrome/browser/chromeos/drive/sync/entry_revert_performer.h
+++ b/chrome/browser/chromeos/drive/sync/entry_revert_performer.h
@@ -25,6 +25,10 @@ namespace drive {
 class JobScheduler;
 class ResourceEntry;
 
+namespace file_system {
+class OperationObserver;
+}  // namespace file_system
+
 namespace internal {
 
 class ResourceMetadata;
@@ -33,6 +37,7 @@ class ResourceMetadata;
 class EntryRevertPerformer {
  public:
   EntryRevertPerformer(base::SequencedTaskRunner* blocking_task_runner,
+                       file_system::OperationObserver* observer,
                        JobScheduler* scheduler,
                        ResourceMetadata* metadata);
   ~EntryRevertPerformer();
@@ -57,7 +62,14 @@ class EntryRevertPerformer {
       google_apis::GDataErrorCode status,
       scoped_ptr<google_apis::ResourceEntry> resource_entry);
 
+  // Part of RevertEntry(). Called after local metadata is updated.
+  void RevertEntryAfterFinishRevert(
+      const FileOperationCallback& callback,
+      const std::vector<base::FilePath>* changed_directories,
+      FileError error);
+
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
+  file_system::OperationObserver* observer_;
   JobScheduler* scheduler_;
   ResourceMetadata* metadata_;