Adds filter support for offscreen canvas

third_party/WebKit/Source/core/css/resolver/FilterOperationResolver.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 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 FilterOperationResolver_h
 #define FilterOperationResolver_h
 
 #include "core/CSSValueKeywords.h"
+#include "core/css/CSSToLengthConversionData.h"
 #include "core/style/FilterOperations.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class CSSValue;
 class StyleResolverState;
 
-class FilterOperationResolver {
+class CORE_EXPORT FilterOperationResolver {
   STATIC_ONLY(FilterOperationResolver);
 
  public:
   static FilterOperation::OperationType filterOperationForType(CSSValueID);
   static FilterOperations createFilterOperations(StyleResolverState&,
                                                  const CSSValue&);
+  static FilterOperations createOffscreenFilterOperations(const CSSValue&);
 };
 
 }  // namespace blink
 
 #endif  // FilterOperationResolver_h