Move property tree debugging code to platform/graphics/paint/ (try #2)

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"
@@ skipping 105 matching lines @@
   // The equality operator is used by FindPropertiesNeedingUpdate.h for checking
   // if a scroll node has changed.
   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;
   }
+
+  String toTreeString() const;
 #endif
 
   String toString() const;
 
  private:
   ScrollPaintPropertyNode(
       PassRefPtr<const ScrollPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> scrollOffsetTranslation,
       IntSize clip,
       IntSize bounds,
@@ skipping 19 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