Simplify RenderLayer's handling of filters.

sky/engine/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 613 matching lines @@
         return cssValuePool().createIdentifierValue(CSSValueNone);
 
     RefPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
 
     RefPtr<CSSFilterValue> filterValue = nullptr;
 
     Vector<RefPtr<FilterOperation> >::const_iterator end = style.filter().operations().end();
     for (Vector<RefPtr<FilterOperation> >::const_iterator it = style.filter().operations().begin(); it != end; ++it) {
         FilterOperation* filterOperation = it->get();
         switch (filterOperation->type()) {
-        case FilterOperation::REFERENCE:
-            filterValue = CSSFilterValue::create(CSSFilterValue::ReferenceFilterOperation);
-            filterValue->append(cssValuePool().createValue(toReferenceFilterOperation(filterOperation)->url(), CSSPrimitiveValue::CSS_STRING));
-            break;
         case FilterOperation::GRAYSCALE:
             filterValue = CSSFilterValue::create(CSSFilterValue::GrayscaleFilterOperation);
             filterValue->append(cssValuePool().createValue(toBasicColorMatrixFilterOperation(filterOperation)->amount(), CSSPrimitiveValue::CSS_NUMBER));
             break;
         case FilterOperation::SEPIA:
             filterValue = CSSFilterValue::create(CSSFilterValue::SepiaFilterOperation);
             filterValue->append(cssValuePool().createValue(toBasicColorMatrixFilterOperation(filterOperation)->amount(), CSSPrimitiveValue::CSS_NUMBER));
             break;
         case FilterOperation::SATURATE:
             filterValue = CSSFilterValue::create(CSSFilterValue::SaturateFilterOperation);
@@ skipping 1665 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace blink