[GeometryInterface] Implement DOMQuad and DOMQuadInit.

third_party/WebKit/Source/core/dom/DOMQuad.h

+// Copyright 2017 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 DOMQuad_h
+#define DOMQuad_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+
+namespace blink {
+
+class DOMPoint;
+class DOMPointInit;
+
+class CORE_EXPORT DOMQuad : public GarbageCollected<DOMQuad>,
+                            public ScriptWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  static DOMQuad* create(DOMPointInit& p1,

[dominicc (has gone to gerrit), 2017/01/11 08:07:54]

Why not make these all const DOMPointInit&; same for the constructor.

[Hwanseung Lee, 2017/01/11 13:34:04]

Done.

+                         DOMPointInit& p2,
+                         DOMPointInit& p3,
+                         DOMPointInit& p4);
+
+  DOMPoint* p1() const { return m_p1; }
+  DOMPoint* p2() const { return m_p2; }
+  DOMPoint* p3() const { return m_p3; }
+  DOMPoint* p4() const { return m_p4; }
+
+  DEFINE_INLINE_TRACE() {
+    visitor->trace(m_p1);
+    visitor->trace(m_p2);
+    visitor->trace(m_p3);
+    visitor->trace(m_p4);
+  }
+
+ private:
+  DOMQuad(DOMPointInit& p1,
+          DOMPointInit& p2,
+          DOMPointInit& p3,
+          DOMPointInit& p4);
+
+  Member<DOMPoint> m_p1;
+  Member<DOMPoint> m_p2;
+  Member<DOMPoint> m_p3;
+  Member<DOMPoint> m_p4;
+};
+
+}  // namespace blink
+
+#endif