Use refs for GraphicsContext

third_party/WebKit/Source/core/inspector/InspectorLayerTreeAgent.cpp

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 172 matching lines @@
     m_instrumentingAgents->setInspectorLayerTreeAgent(0);
     m_snapshotById.clear();
     ErrorString unused;
 }
 
 void InspectorLayerTreeAgent::layerTreeDidChange()
 {
     frontend()->layerTreeDidChange(buildLayerTree());
 }
 
-void InspectorLayerTreeAgent::didPaint(LayoutObject*, const GraphicsLayer* graphicsLayer, GraphicsContext*, const LayoutRect& rect)
+void InspectorLayerTreeAgent::didPaint(LayoutObject*, const GraphicsLayer* graphicsLayer, GraphicsContext&, const LayoutRect& rect)
 {
     // Should only happen for FrameView paints when compositing is off. Consider different instrumentation method for that.
     if (!graphicsLayer)
         return;
 
     RefPtr<TypeBuilder::DOM::Rect> domRect = TypeBuilder::DOM::Rect::create()
         .setX(rect.x())
         .setY(rect.y())
         .setWidth(rect.width())
         .setHeight(rect.height());
@@ skipping 263 matching lines @@
 void InspectorLayerTreeAgent::didRemovePageOverlay(const GraphicsLayer* layer)
 {
     size_t index = m_pageOverlayLayerIds.find(layer->platformLayer()->id());
     if (index == WTF::kNotFound)
         return;
     m_pageOverlayLayerIds.remove(index);
 }
 
 
 } // namespace blink