API functions returning Promises should not throw exceptions.

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 3f88666cfba22a41c3ed8ee49819cb87e86e5e4d..76ba5d0778c5588d98669cc3166f7d57a5f51144 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -2429,6 +2429,24 @@ ScriptPromise Internals::addOneToPromise(ExecutionContext* context, ScriptPromis
     return promise.then(AddOneFunction::create(context));
 }
 
+ScriptPromise Internals::promiseCheck(ExecutionContext* context, long arg1, bool arg2, const Dictionary& arg3, const String& arg4, ExceptionState& es)
+{
+    if (arg2)
+        return ScriptPromise::cast(v8String(toIsolate(context), "done"), toIsolate(context));
+    es.throwDOMException(InvalidStateError, "Thrown from the native implementation.");
+    return ScriptPromise();
+}
+
+ScriptPromise Internals::promiseCheckWithoutExceptionState(ExecutionContext* context, const Dictionary& arg1, const String& arg2, const Vector<String>& arg3)
+{
+    return ScriptPromise::cast(v8String(toIsolate(context), "done"), toIsolate(context));
+}
+
+ScriptPromise Internals::promiseCheckRange(ExecutionContext* context, long arg1)
+{
+    return ScriptPromise::cast(v8String(toIsolate(context), "done"), toIsolate(context));
+}
+
 void Internals::trace(Visitor* visitor)
 {
     visitor->trace(m_frontendWindow);