Skip PaintPhaseDescendantOutlinesOnly if no descendent outlines in the layer

third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp b/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
index 8a608bb31898aaf079140f815b935c16f6ddb103..b4572ab8e2b37aac2b41eb74253ea1c5634ced17 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
@@ -681,7 +681,13 @@ void PaintLayerPainter::paintForegroundForFragments(const PaintLayerFragments& l
     if (!selectionOnly) {
         paintForegroundForFragmentsWithPhase(PaintPhaseFloat, layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags, clipState);
         paintForegroundForFragmentsWithPhase(PaintPhaseForeground, layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags, clipState);
-        paintForegroundForFragmentsWithPhase(PaintPhaseChildOutlines, layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags, clipState);
+
+        if (m_paintLayer.needsPaintPhaseChildOutlines()) {
+            size_t displayItemListSizeBefore = context.paintController().newDisplayItemList().size();
+            paintForegroundForFragmentsWithPhase(PaintPhaseChildOutlines, layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags, clipState);
+            if (displayItemListSizeBefore == context.paintController().newDisplayItemList().size())
+                m_paintLayer.clearNeedsPaintPhaseChildOutlines();
+        }
     }
 }