Keep a persistent handle for the bindings classes to avoid repeated lookups that involve performing…

Source/bindings/dart/DartNativeUtilities.cpp

 // Copyright 2012, Google Inc.
 // 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
@@ skipping 122 matching lines @@
     Dart_Handle exception = 0;
     {
         DartStringAdapter key = DartUtilities::dartToString(Dart_GetNativeArgument(args, 0), exception);
         if (exception)
             goto fail;
 
         DartController* controller = DartController::retrieve(DartUtilities::scriptExecutionContext());
         NPObject* npObject = controller->npObject(key);
         if (npObject) {
             // FIXME: put NPObjects into a map as well.
-            Dart_SetReturnValue(args, DartDOMWrapper::newWrapper("_NPObject", DartUtilities::htmlLibraryName, npObject));
+            Dart_SetReturnValue(args, DartDOMWrapper::newWrapper("_NPObject", DartUtilities::htmlLibraryName, _NPObjectClassId, npObject));
         }
         return;
     }
 
 fail:
     Dart_ThrowException(exception);
     ASSERT_NOT_REACHED();
 }
 
 static void npObjectProperty(Dart_NativeArguments args)
@@ skipping 250 matching lines @@
     if (argumentCount == 3 && str == "NPObject_invoke")
         return npObjectInvoke;
     if (argumentCount == 1 && str == "Window_history_cross_frame_Getter")
         return DartWindowInternal::historyCrossFrameGetter;
     if (argumentCount == 1 && str == "Window_location_cross_frame_Getter")
         return DartWindowInternal::locationCrossFrameGetter;
     return 0;
 }
 
 }