Skip PaintPhaseDescendantOutlinesOnly if no descendent outlines in the layer

third_party/WebKit/Source/core/paint/PaintControllerPaintTest.h

Index: third_party/WebKit/Source/core/paint/PaintControllerPaintTest.h
diff --git a/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.h b/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.h
index 0d4e69ecbaa7393eaa6f048868237b76183f5b24..2621fd19eddc45c06f3af6a997c6f848731e3f0a 100644
--- a/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.h
+++ b/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.h
@@ -83,6 +83,15 @@ protected:
             commit();
     }
 
+    bool displayItemListContains(const DisplayItemList& displayItemList, DisplayItemClient& client, DisplayItem::Type type)
+    {
+        for (auto& item : displayItemList) {
+            if (item.client() == client && item.type() == type)
+                return true;
+        }
+        return false;
+    }
+
 private:
     bool m_originalSlimmingPaintOffsetCachingEnabled;
     bool m_originalSlimmingPaintV2Enabled;