Adding missing include in svg/GradientAttributes.h

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

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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 GradientAttributes_h
 #define GradientAttributes_h
 
+#include "core/svg/SVGGradientElement.h"
 #include "core/svg/SVGUnitTypes.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 struct GradientAttributes {
   DISALLOW_NEW();
   GradientAttributes()
       : m_spreadMethod(SVGSpreadMethodPad),
         m_gradientUnits(SVGUnitTypes::kSvgUnitTypeObjectboundingbox),
@@ skipping 58 matching lines @@
   unsigned c : 8;
 };
 
 static_assert(sizeof(GradientAttributes) ==
                   sizeof(SameSizeAsGradientAttributes),
               "GradientAttributes should stay small");
 
 }  // namespace blink
 
 #endif