Add SVGFitToViewBox::hasValidViewBox helper

third_party/WebKit/Source/core/svg/SVGPatternElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
@@ skipping 144 matching lines @@
 
   if (!attributes.hasY() && element->y()->isSpecified())
     attributes.setY(element->y()->currentValue());
 
   if (!attributes.hasWidth() && element->width()->isSpecified())
     attributes.setWidth(element->width()->currentValue());
 
   if (!attributes.hasHeight() && element->height()->isSpecified())
     attributes.setHeight(element->height()->currentValue());
 
-  if (!attributes.hasViewBox() && element->viewBox()->isSpecified() &&
-      element->viewBox()->currentValue()->isValid())
+  if (!attributes.hasViewBox() && element->hasValidViewBox())
     attributes.setViewBox(element->viewBox()->currentValue()->value());
 
   if (!attributes.hasPreserveAspectRatio() &&
       element->preserveAspectRatio()->isSpecified())
     attributes.setPreserveAspectRatio(
         element->preserveAspectRatio()->currentValue());
 
   if (!attributes.hasPatternUnits() && element->patternUnits()->isSpecified())
     attributes.setPatternUnits(
         element->patternUnits()->currentValue()->enumValue());
@@ skipping 44 matching lines @@
 }
 
 bool SVGPatternElement::selfHasRelativeLengths() const {
   return m_x->currentValue()->isRelative() ||
          m_y->currentValue()->isRelative() ||
          m_width->currentValue()->isRelative() ||
          m_height->currentValue()->isRelative();
 }
 
 }  // namespace blink