Add SVGFitToViewBox::hasValidViewBox helper

third_party/WebKit/Source/core/svg/SVGFitToViewBox.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis@kde.org>
  * Copyright (C) 2014 Samsung Electronics. 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 SVGFitToViewBox_h
 #define SVGFitToViewBox_h
 
 #include "core/SVGNames.h"
-#include "core/dom/QualifiedName.h"
 #include "core/svg/SVGAnimatedPreserveAspectRatio.h"
 #include "core/svg/SVGAnimatedRect.h"
 #include "core/svg/SVGPreserveAspectRatio.h"
 #include "core/svg/SVGRect.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class AffineTransform;
+class QualifiedName;
 
 class SVGFitToViewBox : public GarbageCollectedMixin {
  public:
   static AffineTransform viewBoxToViewTransform(const FloatRect& viewBoxRect,
                                                 SVGPreserveAspectRatio*,
                                                 float viewWidth,
                                                 float viewHeight);
 
   static bool isKnownAttribute(const QualifiedName&);
 
+  bool hasValidViewBox() const { return m_viewBox->currentValue()->isValid(); }
   bool hasEmptyViewBox() const {
     return m_viewBox->currentValue()->isValid() &&
            m_viewBox->currentValue()->value().isEmpty();
   }
 
   // JS API
   SVGAnimatedRect* viewBox() const { return m_viewBox.get(); }
   SVGAnimatedPreserveAspectRatio* preserveAspectRatio() const {
     return m_preserveAspectRatio.get();
   }
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   explicit SVGFitToViewBox(SVGElement*);
 
  private:
   Member<SVGAnimatedRect> m_viewBox;
   Member<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
 };
 
 }  // namespace blink
 
 #endif  // SVGFitToViewBox_h