Add toString() for paint property node classes

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TransformPaintPropertyNode_h
 #define TransformPaintPropertyNode_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint3D.h"
 #include "platform/transforms/TransformationMatrix.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
+#include "wtf/text/WTFString.h"
 
 #include <iosfwd>
 
 namespace blink {
 
 // A transform created by a css property such as "transform" or "perspective"
 // along with a reference to the parent TransformPaintPropertyNode.
 //
 // The transform tree is rooted at a node with no parent. This root node should
 // not be modified.
@@ skipping 59 matching lines @@
   // The equality operator is used by FindPropertiesNeedingUpdate.h for checking
   // if a transform node has changed.
   bool operator==(const TransformPaintPropertyNode& o) const {
     return m_matrix == o.m_matrix && m_origin == o.m_origin &&
            m_parent == o.m_parent &&
            m_flattensInheritedTransform == o.m_flattensInheritedTransform &&
            m_renderingContextID == o.m_renderingContextID;
   }
 #endif
 
+  String toString() const;
+
  private:
   TransformPaintPropertyNode(
       const TransformationMatrix& matrix,
       const FloatPoint3D& origin,
       PassRefPtr<const TransformPaintPropertyNode> parent,
       bool flattensInheritedTransform,
       unsigned renderingContextID)
       : m_matrix(matrix),
         m_origin(origin),
         m_parent(parent),
         m_flattensInheritedTransform(flattensInheritedTransform),
         m_renderingContextID(renderingContextID) {}
 
   TransformationMatrix m_matrix;
   FloatPoint3D m_origin;
   RefPtr<const TransformPaintPropertyNode> m_parent;
   bool m_flattensInheritedTransform;
   unsigned m_renderingContextID;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const TransformPaintPropertyNode&, std::ostream*);
 
 }  // namespace blink
 
 #endif  // TransformPaintPropertyNode_h