v8binding: Don't allow author script to define indexed accessor prop.

third_party/WebKit/Source/bindings/tests/results/core/V8TestIntegerIndexedGlobal.cpp

Index: third_party/WebKit/Source/bindings/tests/results/core/V8TestIntegerIndexedGlobal.cpp
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/V8TestIntegerIndexedGlobal.cpp b/third_party/WebKit/Source/bindings/tests/results/core/V8TestIntegerIndexedGlobal.cpp
index 7cbb68b50aa7e3dbcdb709a1ddcdebfa2df8d91d..809d9c6c71e178e9b8f31168261a3c8ae8d3dfa9 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/V8TestIntegerIndexedGlobal.cpp
+++ b/third_party/WebKit/Source/bindings/tests/results/core/V8TestIntegerIndexedGlobal.cpp
@@ -177,6 +177,28 @@ void V8TestIntegerIndexedGlobal::indexedPropertyDeleterCallback(uint32_t index,
   V8TestIntegerIndexedGlobal::indexedPropertyDeleterCustom(index, info);
 }
 
+void V8TestIntegerIndexedGlobal::indexedPropertyDefinerCallback(
+    uint32_t index,
+    const v8::PropertyDescriptor& desc,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+  // https://heycam.github.io/webidl/#legacy-platform-object-defineownproperty
+  // 3.9.3. [[DefineOwnProperty]]
+  // step 1.1. If the result of calling IsDataDescriptor(Desc) is false, then
+  //   return false.
+  if (desc.has_get() || desc.has_set()) {
+    V8SetReturnValue(info, v8::Null(info.GetIsolate()));
+    if (info.ShouldThrowOnError()) {
+      ExceptionState exceptionState(info.GetIsolate(),
+                                    ExceptionState::kIndexedSetterContext,
+                                    "TestIntegerIndexedGlobal");
+      exceptionState.ThrowTypeError("Accessor properties are not allowed.");
+    }
+    return;
+  }
+
+  // Return nothing and fall back to indexedPropertySetterCallback.
+}
+
 static const V8DOMConfiguration::AccessorConfiguration V8TestIntegerIndexedGlobalAccessors[] = {
     { "length", V8TestIntegerIndexedGlobal::lengthAttributeGetterCallback, V8TestIntegerIndexedGlobal::lengthAttributeSetterCallback, nullptr, nullptr, static_cast<v8::PropertyAttribute>(v8::None), V8DOMConfiguration::kOnInstance, V8DOMConfiguration::kCheckHolder, V8DOMConfiguration::kAllWorlds },
 };
@@ -214,7 +236,15 @@ static void installV8TestIntegerIndexedGlobalTemplate(
       signature, V8TestIntegerIndexedGlobalMethods, WTF_ARRAY_LENGTH(V8TestIntegerIndexedGlobalMethods));
 
   // Indexed properties
-  v8::IndexedPropertyHandlerConfiguration indexedPropertyHandlerConfig(V8TestIntegerIndexedGlobal::indexedPropertyGetterCallback, V8TestIntegerIndexedGlobal::indexedPropertySetterCallback, nullptr, V8TestIntegerIndexedGlobal::indexedPropertyDeleterCallback, IndexedPropertyEnumerator<TestIntegerIndexedGlobal>, v8::Local<v8::Value>(), v8::PropertyHandlerFlags::kNone);
+  v8::IndexedPropertyHandlerConfiguration indexedPropertyHandlerConfig(
+      V8TestIntegerIndexedGlobal::indexedPropertyGetterCallback,
+      V8TestIntegerIndexedGlobal::indexedPropertySetterCallback,
+      nullptr,
+      V8TestIntegerIndexedGlobal::indexedPropertyDeleterCallback,
+      IndexedPropertyEnumerator<TestIntegerIndexedGlobal>,
+      V8TestIntegerIndexedGlobal::indexedPropertyDefinerCallback,
+      v8::Local<v8::Value>(),
+      v8::PropertyHandlerFlags::kNone);
   instanceTemplate->SetHandler(indexedPropertyHandlerConfig);
 
   // Array iterator (@@iterator)