Painter side preparation for subtree caching

Source/core/paint/DisplayItemListPaintTest.cpp

Index: Source/core/paint/DisplayItemListPaintTest.cpp
diff --git a/Source/core/paint/DisplayItemListPaintTest.cpp b/Source/core/paint/DisplayItemListPaintTest.cpp
index 98ab81391bdd2ee998737530fd89da9bd23e1829..038cf381ed23ca03f55545e0e67a2191659a1e92 100644
--- a/Source/core/paint/DisplayItemListPaintTest.cpp
+++ b/Source/core/paint/DisplayItemListPaintTest.cpp
@@ -150,10 +150,12 @@ TEST_F(DisplayItemListPaintTest, InlineRelayout)
     InlineTextBox& newFirstTextBox = *newText.firstTextBox();
     InlineTextBox& secondTextBox = *newText.firstTextBox()->nextTextBox();
 
-    EXPECT_DISPLAY_LIST(rootDisplayItemList().displayItems(), 3,
+    EXPECT_DISPLAY_LIST(rootDisplayItemList().displayItems(), 5,
         TestDisplayItem(layoutView, DisplayItem::BoxDecorationBackground),
+        TestDisplayItem(divBlock, DisplayItem::paintPhaseToBeginSubtreeType(PaintPhaseForeground)),
         TestDisplayItem(newFirstTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
-        TestDisplayItem(secondTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)));
+        TestDisplayItem(secondTextBox, DisplayItem::paintPhaseToDrawingType(PaintPhaseForeground)),
+        TestDisplayItem(divBlock, DisplayItem::paintPhaseToEndSubtreeType(PaintPhaseForeground)));
 }
 
 } // namespace blink