add HitTestCanvasResult Class instend of std::pair<Element*, String>

third_party/WebKit/Source/core/layout/HitTestCanvasResult.h

Index: third_party/WebKit/Source/core/layout/HitTestCanvasResult.h
diff --git a/third_party/WebKit/Source/core/layout/HitTestCanvasResult.h b/third_party/WebKit/Source/core/layout/HitTestCanvasResult.h
new file mode 100644
index 0000000000000000000000000000000000000000..09bc9485bb39cf073a48c349f89787852c5b5a79
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/HitTestCanvasResult.h
@@ -0,0 +1,35 @@
+// 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 HitTestCanvasResult_h
+#define HitTestCanvasResult_h
+
+#include "core/dom/Element.h"
+
+namespace blink {
+
+class CORE_EXPORT HitTestCanvasResult final
+    : public GarbageCollectedFinalized<HitTestCanvasResult>  {
+
+public:
+    static HitTestCanvasResult* create(String id, Member<Element> control)
+    {
+        return new HitTestCanvasResult(id, control);
+    }
+
+    String getId() const;
+    Element* getControl() const;
+
+    DECLARE_TRACE();
+
+private:
+    HitTestCanvasResult(String id, Member<Element> control);
+
+    String m_id;
+    Member<Element> m_control;
+};
+
+} // namespace blink
+
+#endif // HitTestCanvasResult_h