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

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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
@@ skipping 4117 matching lines @@
 
     m_pageOverlays->add(overlay, zOrder);
 }
 
 void WebViewImpl::removePageOverlay(WebPageOverlay* overlay)
 {
     if (m_pageOverlays && m_pageOverlays->remove(overlay) && m_pageOverlays->empty())
         m_pageOverlays = nullptr;
 }
 
+void WebViewImpl::addPageOverlay(PageOverlay::Painter* overlayPainter, int zOrder)
+{
+    if (!m_pageOverlays)
+        m_pageOverlays = PageOverlayList::create(this);
+
+    m_pageOverlays->add(overlayPainter, zOrder);
+}
+
+void WebViewImpl::removePageOverlay(PageOverlay::Painter* overlayPainter)
+{
+    if (m_pageOverlays && m_pageOverlays->remove(overlayPainter) && m_pageOverlays->empty())
+        m_pageOverlays = nullptr;
+}
+
 void WebViewImpl::setOverlayLayer(GraphicsLayer* layer)
 {
     if (!m_rootGraphicsLayer)
         return;
 
     if (!m_page->mainFrame()->isLocalFrame())
         return;
 
     if (pinchVirtualViewportEnabled()) {
         m_page->deprecatedLocalMainFrame()->view()->renderView()->compositor()->setOverlayLayer(layer);
@@ skipping 484 matching lines @@
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 } // namespace blink