Add static root property tree nodes [spv2]

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

Index: third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp b/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp
index e15c20228d1180de4c7e27ee3b6afcfa9fe7b87b..4d0adf75a1a06f6d62d454566149aaa290e7e457 100644
--- a/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp
@@ -130,9 +130,12 @@ TEST_F(PaintControllerPaintTestForSlimmingPaintV2, ChunkIdClientCacheFlag)
         TestDisplayItem(*layoutView().layer(), DisplayItem::kEndSubsequence),
         TestDisplayItem(layoutView(), DisplayItem::clipTypeToEndClipType(DisplayItem::kClipFrameToVisibleContentRect)));
 
+    const PaintChunk& backgroundChunk = rootPaintController().paintChunks()[0];
+    EXPECT_TRUE(backgroundChunk.properties.scroll->isRoot());
+
     const EffectPaintPropertyNode* effectNode = div.objectPaintProperties()->effect();
     EXPECT_EQ(0.5f, effectNode->opacity());
-    const PaintChunk& chunk = rootPaintController().paintChunks()[2];
+    const PaintChunk& chunk = rootPaintController().paintChunks()[1];
     EXPECT_EQ(*div.layer(), chunk.id->client);
     EXPECT_EQ(effectNode, chunk.properties.effect.get());