API functions returning Promises should not throw exceptions.

Source/core/testing/Internals.idl

Index: Source/core/testing/Internals.idl
diff --git a/Source/core/testing/Internals.idl b/Source/core/testing/Internals.idl
index 3fa0e91dde3d28e074600765a149e2a03b40430a..65a3ae4bb61f88fc783b12ea185ff88eae7b97d9 100644
--- a/Source/core/testing/Internals.idl
+++ b/Source/core/testing/Internals.idl
@@ -264,7 +264,10 @@
 
     [CallWith=ScriptState] Promise createResolvedPromise(any value);
     [CallWith=ScriptState] Promise createRejectedPromise(any reason);
-    [CallWith=ExecutionContext] Promise addOneToPromise(Promise promise);
+    [CallWith=ScriptState] Promise addOneToPromise(Promise promise);
+    [CallWith=ScriptState, RaisesException] Promise promiseCheck(long arg1, boolean arg2, Dictionary arg3, DOMString arg4, DOMString[] arg5);
+    [CallWith=ScriptState] Promise promiseCheckWithoutExceptionState(Dictionary arg1, DOMString arg2, DOMString... variadic);
+    [CallWith=ScriptState] Promise promiseCheckRange([EnforceRange] octet arg1);
 
     void setValueForUser(Element element, DOMString value);