[Slimming Paint] Paint the inspector overlay with GraphicsLayer DisplayList.

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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.
  *     * Redistributions in binary form must reproduce the above
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     void setIgnoreInputEvents(bool newValue);
     void setBackgroundColorOverride(WebColor);
     void setZoomFactorOverride(float);
 
     Color baseBackgroundColor() const { return m_baseBackgroundColor; }
 
     WebColor backgroundColorOverride() const { return m_backgroundColorOverride; }
 
     PageOverlayList* pageOverlays() const { return m_pageOverlays.get(); }
+    void addPageOverlay(PageOverlay::Painter*, int zOrder);
+    void removePageOverlay(PageOverlay::Painter*);
 
     void setOverlayLayer(GraphicsLayer*);
 
     const WebPoint& lastMouseDownPoint() const
     {
         return m_lastMouseDownPoint;
     }
 
     Frame* focusedCoreFrame() const;
 
@@ skipping 458 matching lines @@
 };
 
 DEFINE_TYPE_CASTS(WebViewImpl, WebWidget, widget, widget->isWebView(), widget.isWebView());
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif