Don't cache subsequence whose layer is not fully contained by repaint rect

Source/core/paint/DisplayItemListPaintTest.h

Index: Source/core/paint/DisplayItemListPaintTest.h
diff --git a/Source/core/paint/DisplayItemListPaintTest.h b/Source/core/paint/DisplayItemListPaintTest.h
index ac282a254b70039ba2ff40b3c1b7f84f40381406..6574eab4c7f713dc4649a0158da3bc048565cd53 100644
--- a/Source/core/paint/DisplayItemListPaintTest.h
+++ b/Source/core/paint/DisplayItemListPaintTest.h
@@ -52,11 +52,11 @@ protected:
     DisplayItemList& rootDisplayItemList() { return *layoutView().layer()->graphicsLayerBacking()->displayItemList(); }
 
     // Expose some document lifecycle steps for checking new display items before commiting.
-    void updateLifecyclePhasesToPaintForSlimmingPaintV2Clean()
+    void updateLifecyclePhasesToPaintForSlimmingPaintV2Clean(const LayoutRect& interestRect = LayoutRect::infiniteRect())
     {
         document().view()->updateLifecyclePhasesInternal(FrameView::OnlyUpToCompositingCleanPlusScrolling);
         document().view()->invalidateTreeIfNeededRecursive();
-        document().view()->paintForSlimmingPaintV2();
+        document().view()->paintForSlimmingPaintV2(interestRect);
     }
     void compositeForSlimmingPaintV2() { document().view()->compositeForSlimmingPaintV2(); }