Devtools: Create a separate mode to turn LayoutEditor on

Source/web/InspectorOverlayImpl.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 345 matching lines @@
     if (!m_highlightNode)
         return;
 
     bool appendElementInfo = m_highlightNode->isElementNode() && !m_omitTooltip && m_nodeHighlightConfig.showInfo && m_highlightNode->layoutObject() && m_highlightNode->document().frame();
     InspectorHighlight highlight(m_highlightNode.get(), m_nodeHighlightConfig, appendElementInfo);
     if (m_eventTargetNode)
         highlight.appendEventTargetQuads(m_eventTargetNode.get(), m_nodeHighlightConfig);
 
     RefPtr<JSONObject> highlightJSON = highlight.asJSONObject();
     evaluateInOverlay("drawHighlight", highlightJSON.release());
-    if (m_layoutEditor) {
+    if (m_layoutEditor && m_nodeHighlightConfig.showLayoutEditor) {
         RefPtr<JSONObject> layoutEditorInfo = m_layoutEditor->buildJSONInfo();
         if (layoutEditorInfo)
             evaluateInOverlay("showLayoutEditor", layoutEditorInfo.release());
     }
 }
 
 void InspectorOverlayImpl::drawQuadHighlight()
 {
     if (!m_highlightQuad)
         return;
@@ skipping 156 matching lines @@
     --m_suspendCount;
 }
 
 void InspectorOverlayImpl::setLayoutEditor(PassOwnPtrWillBeRawPtr<LayoutEditor> layoutEditor)
 {
     m_layoutEditor = layoutEditor;
     m_overlayHost->setLayoutEditorListener(m_layoutEditor.get());
 }
 
 } // namespace blink