bindings: Supports inheritance of [Unforgeable] attributes as accessor-type properties.

Source/bindings/tests/results/core/V8TestInterfaceEventInitConstructor.cpp

Index: Source/bindings/tests/results/core/V8TestInterfaceEventInitConstructor.cpp
diff --git a/Source/bindings/tests/results/core/V8TestInterfaceEventInitConstructor.cpp b/Source/bindings/tests/results/core/V8TestInterfaceEventInitConstructor.cpp
index e748f70dad3c8346713c1863dd100ee597d3e6de..5a79dc5bd90e720585d5c56e6496bc548f55b792 100644
--- a/Source/bindings/tests/results/core/V8TestInterfaceEventInitConstructor.cpp
+++ b/Source/bindings/tests/results/core/V8TestInterfaceEventInitConstructor.cpp
@@ -53,6 +53,20 @@ static void readonlyStringAttributeAttributeGetterCallback(const v8::FunctionCal
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
+static void isTrustedAttributeGetter(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    v8::Local<v8::Object> holder = info.Holder();
+    TestInterfaceEventInitConstructor* impl = V8TestInterfaceEventInitConstructor::toImpl(holder);
+    v8SetReturnValueBool(info, impl->isTrusted());
+}
+
+static void isTrustedAttributeGetterCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
+    TestInterfaceEventInitConstructorV8Internal::isTrustedAttributeGetter(info);
+    TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
+}
+
 static void constructor(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "TestInterfaceEventInitConstructor", info.Holder(), info.GetIsolate());
@@ -119,6 +133,11 @@ static void installV8TestInterfaceEventInitConstructorTemplate(v8::Local<v8::Fun
     ALLOW_UNUSED_LOCAL(instanceTemplate);
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
+    if (RuntimeEnabledFeatures::trustedEventsEnabled()) {
+        static const V8DOMConfiguration::AccessorConfiguration accessorConfiguration = \
+        {"isTrusted", TestInterfaceEventInitConstructorV8Internal::isTrustedAttributeGetterCallback, 0, 0, 0, 0, v8::DEFAULT, static_cast<v8::PropertyAttribute>(v8::DontDelete), V8DOMConfiguration::ExposedToAllScripts, V8DOMConfiguration::OnInstance, V8DOMConfiguration::CheckHolder};
+        V8DOMConfiguration::installAccessor(isolate, instanceTemplate, prototypeTemplate, functionTemplate, defaultSignature, accessorConfiguration);
+    }
 
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());