Implement -webkit-box-reflect as a filter.

third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/compositing/CompositingInputsUpdater.h"
 
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
 #include "core/layout/compositing/PaintLayerCompositor.h"
 #include "core/paint/PaintLayer.h"
@@ skipping 108 matching lines @@
             // See https://codereview.chromium.org/13912020/
             if (properties.clippedAbsoluteBoundingBox.isEmpty())
                 properties.clippedAbsoluteBoundingBox.setSize(IntSize(1, 1));
 
             IntRect clipRect = pixelSnappedIntRect(layer->clipper().backgroundClipRect(ClipRectsContext(m_rootLayer, AbsoluteClipRects)).rect());
             properties.clippedAbsoluteBoundingBox.intersect(clipRect);
 
             const PaintLayer* parent = layer->parent();
             rareProperties.opacityAncestor = parent->isTransparent() ? parent : parent->opacityAncestor();
             rareProperties.transformAncestor = parent->hasTransformRelatedProperty() ? parent : parent->transformAncestor();
-            rareProperties.filterAncestor = parent->hasFilter() ? parent : parent->filterAncestor();
+            rareProperties.filterAncestor = parent->hasFilterInducingProperty() ? parent : parent->filterAncestor();
             bool layerIsFixedPosition = layer->layoutObject()->style()->position() == FixedPosition;
             rareProperties.nearestFixedPositionLayer = layerIsFixedPosition ? layer : parent->nearestFixedPositionLayer();
 
             if (info.hasAncestorWithClipRelatedProperty) {
                 const PaintLayer* parentLayerOnClippingContainerChain = findParentLayerOnClippingContainerChain(layer);
                 const bool parentHasClipRelatedProperty = parentLayerOnClippingContainerChain->layoutObject()->hasClipRelatedProperty();
                 properties.clippingContainer = parentHasClipRelatedProperty ? parentLayerOnClippingContainerChain->layoutObject() : parentLayerOnClippingContainerChain->clippingContainer();
             }
 
             if (info.lastScrollingAncestor) {
@@ skipping 54 matching lines @@
     ASSERT(!layer->childNeedsCompositingInputsUpdate());
     ASSERT(!layer->needsCompositingInputsUpdate());
 
     for (PaintLayer* child = layer->firstChild(); child; child = child->nextSibling())
         assertNeedsCompositingInputsUpdateBitsCleared(child);
 }
 
 #endif
 
 } // namespace blink