Isolation of subtrees of stacking contexts and out-of-flow positioned objects

third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h

Index: third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
index 2c4af5f7c4e4ac6652fa2faeee09b2552dc4eb6d..4dc668866e2d5f8c2ddfdbd4795b6461abcf953f 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
@@ -7,10 +7,8 @@
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint3D.h"
+#include "platform/graphics/paint/PaintPropertyNode.h"
 #include "platform/transforms/TransformationMatrix.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
 
 #include <iosfwd>
 
@@ -19,7 +17,7 @@ namespace blink {
 // A transform created by a css property such as "transform" or "perspective"
 // along with a reference to the parent TransformPaintPropertyNode, or nullptr
 // for the root.
-class PLATFORM_EXPORT TransformPaintPropertyNode : public RefCounted<TransformPaintPropertyNode> {
+class PLATFORM_EXPORT TransformPaintPropertyNode : public PaintPropertyNode<TransformPaintPropertyNode> {
 public:
     struct Value {
         Value() { }
@@ -45,19 +43,11 @@ public:
     const TransformationMatrix& matrix() const { return m_value.matrix; }
     const FloatPoint3D& origin() const { return m_value.origin; }
 
-    // Parent transform that this transform is relative to, or nullptr if this
-    // is the root transform.
-    TransformPaintPropertyNode* parent() const { return m_parent.get(); }
-
-    // Moves this node and its subtrees under another parent.
-    void setParent(PassRefPtr<TransformPaintPropertyNode> parent) { m_parent = parent; }
-
 private:
     TransformPaintPropertyNode(const Value& value, PassRefPtr<TransformPaintPropertyNode> parent)
-        : m_value(value), m_parent(parent) { }
+        : PaintPropertyNode(parent), m_value(value) { }
 
     Value m_value;
-    RefPtr<TransformPaintPropertyNode> m_parent;
 };
 
 // Redeclared here to avoid ODR issues.