drive: Trigger "fast fetch" if remote update came during full loading.

chrome/browser/chromeos/drive/change_list_loader.h

Index: chrome/browser/chromeos/drive/change_list_loader.h
diff --git a/chrome/browser/chromeos/drive/change_list_loader.h b/chrome/browser/chromeos/drive/change_list_loader.h
index c5c193882b5ede63597b5f2048469cb1c5271d57..e0796fc65a8712e9f6d0a2058bab786101e1c03b 100644
--- a/chrome/browser/chromeos/drive/change_list_loader.h
+++ b/chrome/browser/chromeos/drive/change_list_loader.h
@@ -184,6 +184,11 @@ class ChangeListLoader {
   // Flushes the callbacks for change list loading and all directory loading.
   void OnChangeListLoadComplete(FileError error);
 
+  // Called when the loading about_resource_loader_->UpdateAboutResource is
+  // completed.
+  void OnAboutResourceUpdated(google_apis::GDataErrorCode error,
+                              scoped_ptr<google_apis::AboutResource> resource);
+
   // ================= Implementation for change list loading =================
 
   // Part of LoadFromServerIfNeeded().