Set plugin focus by implementing HTMLPlugInElement::SetFocused.

third_party/WebKit/Source/core/html/HTMLAreaElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2009, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLAreaElement_h
 #define HTMLAreaElement_h
 
+#include <memory>
 #include "core/CoreExport.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "platform/geometry/LayoutRect.h"
-#include <memory>
+#include "public/platform/WebFocusType.h"
 
 namespace blink {
 
 class HTMLImageElement;
 class Path;
 
 class CORE_EXPORT HTMLAreaElement final : public HTMLAnchorElement {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
@@ skipping 18 matching lines @@
 
  private:
   explicit HTMLAreaElement(Document&);
   ~HTMLAreaElement();
 
   void ParseAttribute(const AttributeModificationParams&) override;
   bool IsKeyboardFocusable() const override;
   bool IsMouseFocusable() const override;
   bool LayoutObjectIsFocusable() const override;
   void UpdateFocusAppearance(SelectionBehaviorOnFocus) override;
-  void SetFocused(bool) override;
+  void SetFocused(bool, WebFocusType) override;
 
   enum Shape { kDefault, kPoly, kRect, kCircle };
   void InvalidateCachedPath();
 
   mutable std::unique_ptr<Path> path_;
   Vector<double> coords_;
   Shape shape_;
 };
 
 }  // namespace blink
 
 #endif  // HTMLAreaElement_h