Add Object::IsDirty function in the API.

src/objects.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1409 matching lines @@
   Object* GetPropertyPostInterceptor(JSObject* receiver,
                                      String* name,
                                      PropertyAttributes* attributes);
   Object* GetLazyProperty(Object* receiver,
                           LookupResult* result,
                           String* name,
                           PropertyAttributes* attributes);
 
   // Tells whether this object needs to be loaded.
   inline bool IsLoaded();
+  
+  // Returns true if this is an instance of an api function and has
+  // been modified since it was created.  May give false positives.
+  bool IsDirty();
 
   bool HasProperty(String* name) {
     return GetPropertyAttribute(name) != ABSENT;
   }
 
   // Can cause a GC if it hits an interceptor.
   bool HasLocalProperty(String* name) {
     return GetLocalPropertyAttribute(name) != ABSENT;
   }
 
@@ skipping 3423 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_