Implement custom element construction and some 'define' checks

third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.h

Index: third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.h
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.h b/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.h
new file mode 100644
index 0000000000000000000000000000000000000000..44b22e382bcb1fbf632a6ead0f95f037e17980a9
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.h
@@ -0,0 +1,46 @@
+// 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.
+
+#ifndef CustomElementDefinition_h
+#define CustomElementDefinition_h
+
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "platform/heap/Handle.h"
+#include "v8.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+class CustomElementDefinition final
+    : public GarbageCollectedFinalized<CustomElementDefinition> {
+public:
+    CustomElementDefinition(
+        const AtomicString& localName,
+        v8::Isolate*,
+        v8::Local<v8::Object> prototype);
+
+    const AtomicString& localName() const { return m_localName; }
+    v8::Local<v8::Object> prototype(v8::Isolate*) const;
+
+    void setReference(
+        v8::Isolate* isolate,
+        const v8::Persistent<v8::Object>& parent) const
+    {
+        DCHECK(!m_prototype.isEmpty());
+        m_prototype.setReference(parent, isolate);
+    }
+
+    DEFINE_INLINE_TRACE() { }
+
+private:
+    static void didCollectPrototype(
+        const v8::WeakCallbackInfo<CustomElementDefinition>&);
+
+    AtomicString m_localName;
+    ScopedPersistent<v8::Object> m_prototype;
+};
+
+} // namespace blink
+
+#endif // CustomElementDefinition_h