Implement custom element construction and some 'define' checks

third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..340f686449c128bd6ed14c5beaa275d7c42e3fb6
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
@@ -0,0 +1,72 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "bindings/core/v8/V8HTMLElement.h"
+
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8ThrowException.h"
+#include "core/dom/Document.h"
+#include "core/dom/custom/CustomElementDefinition.h"
+#include "core/dom/custom/CustomElementsRegistry.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "platform/RuntimeEnabledFeatures.h"
+
+namespace blink {
+
+void V8HTMLElement::constructorCustom(
+    const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    ASSERT(info.IsConstructCall());
+    v8::Isolate* isolate = info.GetIsolate();
+
+    if (!RuntimeEnabledFeatures::customElementsV1Enabled()
+        || !DOMWrapperWorld::current(isolate).isMainWorld()) {
+        V8ThrowException::throwIllegalConstructorTypeError(isolate);
+        return;
+    }
+
+    Document* document = toDocument(currentExecutionContext(isolate));
+    v8::Local<v8::Context> context = isolate->GetCurrentContext();
+    CustomElementDefinition* def =
+        document->domWindow()->customElements()->definitionForConstructor(
+            context,
+            info.NewTarget());
+    if (!def) {
+        V8ThrowException::throwIllegalConstructorTypeError(isolate);
+        return;
+    }
+
+    // TODO(dominicc): Implement cases where the definition's
+    // construction stack is not empty when parser-creation is
+    // implemented.
+    ExceptionState exceptionState(
+        ExceptionState::ConstructionContext,
+        "HTMLElement",
+        info.Holder(),
+        isolate);
+    Element* element = document->createElement(
+        def->localName(),
+        AtomicString(),
+        exceptionState);
+    if (exceptionState.throwIfNeeded())
+        return;
+    v8::Local<v8::Object> wrapper = element->wrap(isolate, info.Holder());
+    info.GetReturnValue().Set(wrapper);
+    if (wrapper.IsEmpty())
+        return;
+
+    v8::Maybe<bool> couldSetPrototype =
+        wrapper->SetPrototype(context, def->prototype(isolate));
+    if (couldSetPrototype.IsNothing())
+        return;
+    if (!couldSetPrototype.FromJust()) {
+        // TODO(dominicc): Find out when SetPrototype can fail and write a
+        // test for this.
+        return;
+    }
+}
+
+} // namespace blink