Update plugin to handle new style rules for virtual annotations.

tools/clang/plugins/Options.h

Index: tools/clang/plugins/Options.h
diff --git a/tools/clang/plugins/Options.h b/tools/clang/plugins/Options.h
index 82dfafb645bf2bed4e3f4b1938e47de904b49287..2710fc623f04bb763848a195abd36b19521891de 100644
--- a/tools/clang/plugins/Options.h
+++ b/tools/clang/plugins/Options.h
@@ -11,11 +11,13 @@ struct Options {
   Options()
       : check_base_classes(false),
         check_weak_ptr_factory_order(false),
-        check_enum_last_value(false) {}
+        check_enum_last_value(false),
+        strict_virtual_annotations(false) {}
 
   bool check_base_classes;
   bool check_weak_ptr_factory_order;
   bool check_enum_last_value;
+  bool strict_virtual_annotations;
 };
 
 }  // namespace chrome_checker