Keep track of type parameter processing in mixin application classes.

runtime/vm/class_finalizer.h

Index: runtime/vm/class_finalizer.h
===================================================================
--- runtime/vm/class_finalizer.h	(revision 27140)
+++ runtime/vm/class_finalizer.h	(working copy)
@@ -93,6 +93,9 @@
   static void ResolveRedirectingFactory(const Class& cls,
                                         const Function& factory);
 
+  // Apply the mixin type to the mixin application class.
+  static void ApplyMixinType(const Class& mixin_app_class);
+
  private:
   static bool IsSuperCycleFree(const Class& cls);
   static bool IsParameterTypeCycleFree(const Class& cls,
@@ -108,8 +111,7 @@
       const Class& cls,
       const Function& factory,
       const GrowableObjectArray& visited_factories);
-  static void CloneTypeParameters(const Class& mixapp_class);
-  static void ApplyMixinTypes(const Class& cls);
+  static void CloneTypeParameters(const Class& mixin_app_class);
   static void ApplyMixin(const Class& cls);
   static void CreateForwardingConstructors(
       const Class& mixin_app,