Introduce FragmentData, and put ObjectPaintProperties into it.

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

Index: third_party/WebKit/Source/core/paint/RarePaintData.cpp
diff --git a/third_party/WebKit/Source/core/paint/RarePaintData.cpp b/third_party/WebKit/Source/core/paint/RarePaintData.cpp
index 896be5123214fb527973d4f34edf7484b5f6e782..c7626b10696a9579398f3259f43104bfd8652885 100644
--- a/third_party/WebKit/Source/core/paint/RarePaintData.cpp
+++ b/third_party/WebKit/Source/core/paint/RarePaintData.cpp
@@ -4,7 +4,7 @@
 
 #include "core/paint/RarePaintData.h"
 
-#include "core/paint/ObjectPaintProperties.h"
+#include "core/paint/FragmentData.h"
 #include "core/paint/PaintLayer.h"
 
 namespace blink {
@@ -17,10 +17,10 @@ void RarePaintData::SetLayer(std::unique_ptr<PaintLayer> layer) {
   layer_ = std::move(layer);
 };
 
-ObjectPaintProperties& RarePaintData::EnsurePaintProperties() {
-  if (!paint_properties_)
-    paint_properties_ = ObjectPaintProperties::Create();
-  return *paint_properties_.get();
+FragmentData& RarePaintData::EnsureFragment() const {
+  if (!fragment_data_)
+    fragment_data_ = FragmentData::Create();
+  return *fragment_data_.get();
 }
 
 void RarePaintData::ClearPaintProperties() {