Move scroll paint property nodes to be owned by the transform tree

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 8bb3ea12991bb8cd19a38bda495a93b2b069a549..7dfd6d2389cc8972ecb48fe3816b161357cae966 100644
--- a/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintControllerPaintTest.cpp
@@ -228,7 +228,9 @@ TEST_P(PaintControllerPaintTestForSlimmingPaintV2, ChunkIdClientCacheFlag) {
   }
 
   const PaintChunk& backgroundChunk = rootPaintController().paintChunks()[0];
-  EXPECT_TRUE(backgroundChunk.properties.propertyTreeState.scroll()->isRoot());
+  EXPECT_EQ(
+      nullptr,

[chrishtr, 2017/01/26 21:22:58]

Not sentinel scroll root?

[pdr., 2017/01/27 20:09:32]

This is really just an overzealous check that the background doesn't scroll, but
it looks confusing. I've added a new function to TransformPaintPropertyNode to
make this clearer (isScrollTranslation()) and used the new function to make this
test clearer.

+      backgroundChunk.properties.propertyTreeState.transform()->scrollNode());
 
   const EffectPaintPropertyNode* effectNode = div.paintProperties()->effect();
   EXPECT_EQ(0.5f, effectNode->opacity());