Fix V8 bindings for named constructors to set prototype object correctly

third_party/WebKit/Source/bindings/tests/results/core/V8TestInterfaceConstructor.cpp

Index: third_party/WebKit/Source/bindings/tests/results/core/V8TestInterfaceConstructor.cpp
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterfaceConstructor.cpp b/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterfaceConstructor.cpp
index 0a46fdaba5a704908650023e44b801beb369c7ce..6a3ea30ec63f8da071225e153131c9841885aaa3 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterfaceConstructor.cpp
+++ b/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterfaceConstructor.cpp
@@ -17,6 +17,7 @@
 #include "bindings/core/v8/LongOrTestDictionary.h"
 #include "bindings/core/v8/V8DOMConfiguration.h"
 #include "bindings/core/v8/V8ObjectConstructor.h"
+#include "bindings/core/v8/V8PrivateProperty.h"
 #include "bindings/core/v8/V8TestDictionary.h"
 #include "bindings/core/v8/V8TestInterfaceEmpty.h"
 #include "core/dom/Document.h"
@@ -359,12 +360,50 @@ v8::Local<v8::FunctionTemplate> V8TestInterfaceConstructorConstructor::domTempla
   result = v8::FunctionTemplate::New(isolate, V8TestInterfaceConstructorConstructorCallback);
   v8::Local<v8::ObjectTemplate> instanceTemplate = result->InstanceTemplate();
   instanceTemplate->SetInternalFieldCount(V8TestInterfaceConstructor::internalFieldCount);
-  result->SetClassName(v8AtomicString(isolate, "TestInterfaceConstructor"));
+  result->SetClassName(v8AtomicString(isolate, "Audio"));
   result->Inherit(V8TestInterfaceConstructor::domTemplate(isolate, world));
   data->setInterfaceTemplate(world, &domTemplateKey, result);
   return result;
 }
 
+void V8TestInterfaceConstructorConstructor::NamedConstructorAttributeGetter(
+    v8::Local<v8::Name> propertyName,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+  v8::Local<v8::Value> data = info.Data();
+  DCHECK(data->IsExternal());
+  V8PerContextData* perContextData =
+      V8PerContextData::from(info.Holder()->CreationContext());
+  if (!perContextData)
+    return;
+
+  v8::Local<v8::Function> namedConstructor = perContextData->constructorForType(&V8TestInterfaceConstructorConstructor::wrapperTypeInfo);
+  v8::Local<v8::Function> interface = perContextData->constructorForType(&V8TestInterfaceConstructor::wrapperTypeInfo);
+
+  // Set the prototype of named constructors to the regular constructor.
+  v8::Local<v8::Context> context = info.GetIsolate()->GetCurrentContext();
+  auto privateProperty = V8PrivateProperty::getNamedConstructorInitialized(info.GetIsolate());
+  v8::Local<v8::Value> privateValue = privateProperty.get(context, namedConstructor);
+  if (privateValue.IsEmpty()) {
+    // Only Window exposes named constructors, so that will always be the interface name.
+    ExceptionState exceptionState(info.GetIsolate(), ExceptionState::GetterContext, "Window", "Audio");
+    v8::MaybeLocal<v8::Value> interfacePrototype = interface->Get(context, v8AtomicString(info.GetIsolate(), "prototype"));
+    if (interfacePrototype.IsEmpty()) {
+      exceptionState.throwTypeError("Could not get prototype for V8TestInterfaceConstructor.");
+      return;
+    }
+
+    v8::Maybe<bool> setResult = namedConstructor->Set(context, v8AtomicString(info.GetIsolate(), "prototype"), interfacePrototype.ToLocalChecked());
+    if (setResult.IsNothing() || setResult.ToChecked() != true) {
+      exceptionState.throwTypeError("Could not set prototype for Audio.");
+      return;
+    }
+
+    privateProperty.set(context, namedConstructor, v8::True(info.GetIsolate()));
+  }
+
+  v8SetReturnValue(info, namedConstructor);
+}
+
 void V8TestInterfaceConstructor::constructorCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
   UseCounter::count(currentExecutionContext(info.GetIsolate()), UseCounter::TestFeature);
   if (!info.IsConstructCall()) {