CompositingInputsUpdater should do more clip parent analysis

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

Index: third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
index 46652d9eae9582bf4017fb8708d824a35d7b34db..6782b558f5d8b503c8eb9bf89a8567e21c14769c 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositingInputsUpdater.cpp
@@ -152,6 +152,12 @@ void CompositingInputsUpdater::updateRecursive(PaintLayer* layer, UpdateType upd
                 const PaintLayer* parentLayerOnClippingContainerChain = findParentLayerOnClippingContainerChain(layer);
                 const bool parentHasClipRelatedProperty = parentLayerOnClippingContainerChain->layoutObject()->hasClipRelatedProperty();
                 properties.clippingContainer = parentHasClipRelatedProperty ? parentLayerOnClippingContainerChain->layoutObject() : parentLayerOnClippingContainerChain->clippingContainer();
+
+                if (layer->layoutObject()->isOutOfFlowPositioned() && !layer->subtreeIsInvisible()) {
+                    const PaintLayer* clippingLayer = properties.clippingContainer ? properties.clippingContainer->enclosingLayer() : layer->compositor()->rootLayer();
+                    if (hasClippedStackingAncestor(layer, clippingLayer))
+                        rareProperties.clipParent = clippingLayer;
+                }
             }
 
             if (info.lastScrollingAncestor) {
@@ -162,12 +168,6 @@ void CompositingInputsUpdater::updateRecursive(PaintLayer* layer, UpdateType upd
                 if (parentLayerOnContainingBlockChain->scrollsOverflow())
                     rareProperties.ancestorScrollingLayer = parentLayerOnContainingBlockChain;
 
-                if (layer->layoutObject()->isOutOfFlowPositioned() && !layer->subtreeIsInvisible()) {
-                    const PaintLayer* clippingLayer = properties.clippingContainer ? properties.clippingContainer->enclosingLayer() : layer->compositor()->rootLayer();
-                    if (hasClippedStackingAncestor(layer, clippingLayer))
-                        rareProperties.clipParent = clippingLayer;
-                }
-
                 if (layer->stackingNode()->isStacked()
                     && rareProperties.ancestorScrollingLayer
                     && !info.ancestorStackingContext->layoutObject()->isDescendantOf(rareProperties.ancestorScrollingLayer->layoutObject()))