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 7ff3eef3fabf9fcbf135b808dc4f78bcae459381..80d2958cefad0e210611448cdbd7e1c2b9e8adb6 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
@@ -680,7 +680,13 @@ 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(PaintPhaseDescendantOutlinesOnly, layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags, clipState);
+
+        if (m_paintLayer.needsPaintPhaseDescendantOutlines()) {
+            size_t displayItemListSizeBefore = context.paintController().newDisplayItemList().size();
+            paintForegroundForFragmentsWithPhase(PaintPhaseDescendantOutlinesOnly, layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags, clipState);
+            if (displayItemListSizeBefore == context.paintController().newDisplayItemList().size())
+                m_paintLayer.clearNeedsPaintPhaseDescendantOutlines();
+        }
     }
 }