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

third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.cpp

 // 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.
 
 #include "platform/graphics/paint/PropertyTreeState.h"
 
 #include "platform/graphics/paint/GeometryMapper.h"
 
 namespace blink {
 
@@ skipping 55 matching lines @@
       return &m_properties;
     case PropertyTreeState::Effect:
       m_properties.setEffect(m_properties.effect()->parent());
       return &m_properties;
     case PropertyTreeState::None:
       return nullptr;
   }
   return nullptr;
 }
 
+#if DCHECK_IS_ON()
+
+String PropertyTreeState::toTreeString() const {
+  return transform()->toTreeString() + "\n" + clip()->toTreeString() + "\n" +
+         effect()->toTreeString() + "\n" + scroll()->toTreeString();
+}
+
+#endif
+
 }  // namespace blink