Add toString() for paint property node classes

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

 // Copyright 2016 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 ScrollPaintPropertyNode_h
 #define ScrollPaintPropertyNode_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "platform/scroll/MainThreadScrollingReason.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
+#include "wtf/text/WTFString.h"
 
 #include <iosfwd>
 
 namespace blink {
 
 using MainThreadScrollingReasons = uint32_t;
 
 // A scroll node contains auxiliary scrolling information for threaded scrolling
 // which includes how far an area can be scrolled, which transform node contains
 // the scroll offset, etc.
@@ skipping 91 matching lines @@
   bool operator==(const ScrollPaintPropertyNode& o) const {
     return m_parent == o.m_parent &&
            m_scrollOffsetTranslation == o.m_scrollOffsetTranslation &&
            m_clip == o.m_clip && m_bounds == o.m_bounds &&
            m_userScrollableHorizontal == o.m_userScrollableHorizontal &&
            m_userScrollableVertical == o.m_userScrollableVertical &&
            m_mainThreadScrollingReasons == o.m_mainThreadScrollingReasons;
   }
 #endif
 
+  String toString() const;
+
  private:
   ScrollPaintPropertyNode(
       PassRefPtr<const ScrollPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> scrollOffsetTranslation,
       IntSize clip,
       IntSize bounds,
       bool userScrollableHorizontal,
       bool userScrollableVertical,
       MainThreadScrollingReasons mainThreadScrollingReasons)
       : m_parent(parent),
@@ skipping 15 matching lines @@
   MainThreadScrollingReasons m_mainThreadScrollingReasons;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const ScrollPaintPropertyNode&, std::ostream*);
 
 }  // namespace blink
 
 #endif  // ScrollPaintPropertyNode_h