IDL compiler: 3 more special types for methods

Source/bindings/templates/methods.cpp

 {##############################################################################}
 {% macro generate_method(method) %}
 static void {{method.name}}Method(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     {% if method.number_of_required_arguments %}
     if (UNLIKELY(args.Length() < {{method.number_of_required_arguments}})) {
         throwTypeError(ExceptionMessages::failedToExecute("{{method.name}}", "{{interface_name}}", ExceptionMessages::notEnoughArguments({{method.number_of_required_arguments}}, args.Length())), args.GetIsolate());
         return;
     }
     {% endif %}
@@ skipping 23 matching lines @@
     {{argument.v8_value_to_local_cpp_value}};
     {% endif %}
     {% if argument.enum_validation_expression %}
     {# Methods throw on invalid enum values: http://www.w3.org/TR/WebIDL/#idl-enums #}
     String string = {{argument.name}};
     if (!({{argument.enum_validation_expression}})) {
         throwTypeError(ExceptionMessages::failedToExecute("{{method.name}}", "{{interface_name}}", "parameter {{argument.index + 1}} ('" + string + "') is not a valid enum value."), args.GetIsolate());
         return;
     }
     {% endif %}
+    {% if argument.idl_type == 'Dictionary' %}
+    if (!dictionaryArg.isUndefinedOrNull() && !dictionaryArg.isObject()) {
+        throwTypeError(ExceptionMessages::failedToExecute("voidMethodDictionaryArg", "TestObjectPython", "parameter 1 ('dictionaryArg') is not an object."), args.GetIsolate());
+        return;
+    }
+    {% endif %}
     {% endfor %}
     {{method.cpp_method}};
 }
 {% endmacro %}
 
 
 {##############################################################################}
 {% macro method_callback(method) %}
 static void {{method.name}}MethodCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMMethod");
     {{cpp_class_name}}V8Internal::{{method.name}}Method(args);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 {% endmacro %}