Add null-correctness checking to [StrictTypeChecking] methods

Source/bindings/tests/idls/TestObjectPython.idl

Index: Source/bindings/tests/idls/TestObjectPython.idl
diff --git a/Source/bindings/tests/idls/TestObjectPython.idl b/Source/bindings/tests/idls/TestObjectPython.idl
index c29db71c38054495352a4711e7aa35928d8a5f26..eafd52c60b5d1d3816b9ecda489abb5b7d9d3c03 100644
--- a/Source/bindings/tests/idls/TestObjectPython.idl
+++ b/Source/bindings/tests/idls/TestObjectPython.idl
@@ -123,6 +123,7 @@ interface TestObjectPython {
     // Nullable attributes
     attribute DOMString? nullableStringAttribute;
     attribute long? nullableLongAttribute;
+    attribute TestInterface? nullableTestInterfaceAttribute;
     // Enumerations
     attribute TestEnum testEnumAttribute;
     // Static attributes
@@ -409,6 +410,7 @@ interface TestObjectPython {
     [RuntimeEnabled=FeatureName] void runtimeEnabledVoidMethod();
     [PerWorldBindings, RuntimeEnabled=FeatureName] void perWorldBindingsRuntimeEnabledVoidMethod();
     [StrictTypeChecking] void strictTypeCheckingVoidMethodTestInterfaceEmptyArg(TestInterfaceEmpty testInterfaceEmptyArg);
+    [StrictTypeChecking] void strictTypeCheckingVoidMethodNullableTestInterfaceEmptyArg(TestInterfaceEmpty? testInterfaceEmptyArg);
     [TreatReturnedNullStringAs=Null] DOMString treatReturnedNullStringAsNullStringMethod();
     [TreatReturnedNullStringAs=Undefined] DOMString treatReturnedNullStringAsUndefinedStringMethod();
     [Unforgeable] void unforgeableVoidMethod();