Implement -webkit-box-reflect as a filter.

third_party/WebKit/Source/core/style/ComputedStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 442 matching lines @@
     LayoutRectOutsets imageOutsets(const NinePieceImage&) const;
     bool hasBorderImageOutsets() const
     {
         return borderImage().hasImage() && borderImage().outset().nonZero();
     }
     LayoutRectOutsets borderImageOutsets() const
     {
         return imageOutsets(borderImage());
     }
 
-    bool hasFilterOutsets() const { return hasFilter() && filter().hasOutsets(); }
+    // Returns |true| if any property that renders using filter operations is
+    // used (including, but not limited to, 'filter').
+    bool hasFilterInducingProperty() const { return hasFilter() || (RuntimeEnabledFeatures::cssBoxReflectFilterEnabled() && hasBoxReflect()); }
+
     Order rtlOrdering() const { return static_cast<Order>(inherited_flags.m_rtlOrdering); }
     void setRTLOrdering(Order o) { inherited_flags.m_rtlOrdering = o; }
 
     bool isStyleAvailable() const;
 
     bool hasAnyPublicPseudoStyles() const;
     bool hasPseudoStyle(PseudoId) const;
     void setHasPseudoStyle(PseudoId);
     bool hasUniquePseudoStyle() const;
     bool hasPseudoElementStyle() const;
@@ skipping 366 matching lines @@
 
     const GridPosition& gridColumnStart() const { return rareNonInheritedData->m_gridItem->m_gridColumnStart; }
     const GridPosition& gridColumnEnd() const { return rareNonInheritedData->m_gridItem->m_gridColumnEnd; }
     const GridPosition& gridRowStart() const { return rareNonInheritedData->m_gridItem->m_gridRowStart; }
     const GridPosition& gridRowEnd() const { return rareNonInheritedData->m_gridItem->m_gridRowEnd; }
 
     ShadowList* boxShadow() const { return rareNonInheritedData->m_boxShadow.get(); }
 
     EBoxDecorationBreak boxDecorationBreak() const { return m_box->boxDecorationBreak(); }
     StyleReflection* boxReflect() const { return rareNonInheritedData->m_boxReflect.get(); }
+    bool hasBoxReflect() const { return boxReflect(); }
     bool reflectionDataEquivalent(const ComputedStyle* otherStyle) const { return rareNonInheritedData->reflectionDataEquivalent(*otherStyle->rareNonInheritedData); }
 
     // FIXME: reflections should belong to this helper function but they are currently handled
     // through their self-painting layers. So the layout code doesn't account for them.
     bool hasVisualOverflowingEffect() const { return boxShadow() || hasBorderImageOutsets() || hasOutline(); }
 
     Containment contain() const { return static_cast<Containment>(rareNonInheritedData->m_contain); }
     bool containsPaint() const { return rareNonInheritedData->m_contain & ContainsPaint; }
     bool containsStyle() const { return rareNonInheritedData->m_contain & ContainsStyle; }
     bool containsLayout() const { return rareNonInheritedData->m_contain & ContainsLayout; }
@@ skipping 774 matching lines @@
 
     void setHasExplicitlyInheritedProperties() { noninherited_flags.explicitInheritance = true; }
     bool hasExplicitlyInheritedProperties() const { return noninherited_flags.explicitInheritance; }
 
     void setHasVariableReferenceFromNonInheritedProperty() { noninherited_flags.variableReference = true; }
     bool hasVariableReferenceFromNonInheritedProperty() const { return noninherited_flags.variableReference; }
 
     bool hasChildDependentFlags() const { return emptyState() || hasExplicitlyInheritedProperties(); }
     void copyChildDependentFlagsFrom(const ComputedStyle&);
 
-    bool hasBoxDecorations() const { return hasBorderDecoration() || hasBorderRadius() || hasOutline() || hasAppearance() || boxShadow() || hasFilter() || hasBackdropFilter() || resize() != RESIZE_NONE; }
+    bool hasBoxDecorations() const
+    {
+        return hasBorderDecoration()
+            || hasBorderRadius()
+            || hasOutline()
+            || hasAppearance()
+            || boxShadow()
+            || hasFilterInducingProperty()
+            || hasBackdropFilter()
+            || resize() != RESIZE_NONE;
+    }
 
     bool borderObscuresBackground() const;
     void getBorderEdgeInfo(BorderEdge edges[], bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true) const;
 
     void setHasAuthorBackground(bool authorBackground) { SET_VAR(rareNonInheritedData, m_hasAuthorBackground, authorBackground); }
     void setHasAuthorBorder(bool authorBorder) { SET_VAR(rareNonInheritedData, m_hasAuthorBorder, authorBorder); }
     bool hasAuthorBackground() const { return rareNonInheritedData->m_hasAuthorBackground; };
     bool hasAuthorBorder() const { return rareNonInheritedData->m_hasAuthorBorder; };
 
     // Initial values for all the properties
@@ skipping 382 matching lines @@
 }
 
 inline bool ComputedStyle::hasPseudoElementStyle() const
 {
     return noninherited_flags.pseudoBits & ElementPseudoIdMask;
 }
 
 } // namespace blink
 
 #endif // ComputedStyle_h