Add an API to report debugName in GraphicsLayer

Source/core/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 348 matching lines @@
 
 typedef Vector<LayerFragment, 1> LayerFragments;
 
 class RenderLayer : public ScrollableArea {
 public:
     friend class RenderReplica;
 
     RenderLayer(RenderLayerModelObject*);
     ~RenderLayer();
 
-#ifndef NDEBUG
     String debugName() const;
-#endif
 
     RenderLayerModelObject* renderer() const { return m_renderer; }
     RenderBox* renderBox() const { return m_renderer && m_renderer->isBox() ? toRenderBox(m_renderer) : 0; }
     RenderLayer* parent() const { return m_parent; }
     RenderLayer* previousSibling() const { return m_previous; }
     RenderLayer* nextSibling() const { return m_next; }
     RenderLayer* firstChild() const { return m_first; }
     RenderLayer* lastChild() const { return m_last; }
 
     void addChild(RenderLayer* newChild, RenderLayer* beforeChild = 0);
@@ skipping 988 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const WebCore::RenderLayer*);
 void showLayerTree(const WebCore::RenderObject*);
 #endif
 
 #endif // RenderLayer_h