initialize result variables in v8 bindings

Source/bindings/templates/methods.cpp

 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     {# Local variables #}
     {% if method.has_exception_state %}
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {# Overloaded methods have length checked during overload resolution #}
@@ skipping 229 matching lines @@
 RefPtrWillBeRawPtr<ScriptArguments> scriptArguments(createScriptArguments(scriptState, info, {{method.number_of_arguments}}));
 {% endif %}
 {% if method.is_call_with_document %}
 {# [ConstructorCallWith=Document] #}
 Document& document = *toDocument(currentExecutionContext(info.GetIsolate()));
 {% endif %}
 {# Call #}
 {% if method.idl_type == 'void' %}
 {{cpp_value}};
 {% elif method.is_implemented_in_private_script %}
-{{method.cpp_type}} result;
+{{method.cpp_type}} result{% if method.cpp_type == 'int' %} = 0{% endif %};

[haraken, 2014/07/15 15:13:25]

method.cpp_type == 'int' is a bit too hacky.

Can we add method.cpp_type_default_value and use it here? I think you can set
method.cpp_type_default_value to 0 if idl_type.is_numeric_type() is true.

 if (!{{method.cpp_value}})
     return;
 {% elif method.is_constructor %}
 {{method.cpp_type}} impl = {{cpp_value}};
 {% elif method.use_local_result and not method.union_arguments %}
 {{method.cpp_type}} result = {{cpp_value}};
 {% endif %}
 {# Post-call #}
 {% if method.is_raises_exception %}
 if (exceptionState.hadException()) {
@@ skipping 336 matching lines @@
 v8::Handle<v8::Object> wrapper = wrap(impl.get(), info.Holder(), isolate);
 {% else %}
 {% set constructor_class = v8_class + ('Constructor'
                                        if constructor.is_named_constructor else
                                        '') %}
 v8::Handle<v8::Object> wrapper = info.Holder();
 V8DOMWrapper::associateObjectWithWrapper<{{v8_class}}>(impl.release(), &{{constructor_class}}::wrapperTypeInfo, wrapper, isolate, {{wrapper_configuration}});
 {% endif %}
 v8SetReturnValue(info, wrapper);
 {% endmacro %}