Devtools: Create a separate mode to turn LayoutEditor on

Source/core/inspector/InspectorDOMAgent.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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
@@ skipping 1202 matching lines @@
 
     if (node && m_inspectModeHighlightConfig) {
         m_hoveredNodeForInspectMode = node;
         m_overlay->highlightNode(node, eventTarget, *m_inspectModeHighlightConfig, event.ctrlKey() || event.metaKey());
     }
     return true;
 }
 
 void InspectorDOMAgent::setSearchingForNode(ErrorString* errorString, SearchMode searchMode, JSONObject* highlightInspectorObject)
 {
-    if (m_searchingForNode == searchMode)
-        return;
-
     m_searchingForNode = searchMode;
     m_overlay->setInspectModeEnabled(searchMode != NotSearching);
     if (searchMode != NotSearching) {
         m_inspectModeHighlightConfig = highlightConfigFromInspectorObject(errorString, highlightInspectorObject);
-        if (!m_inspectModeHighlightConfig)
-            return;
     } else {
         m_hoveredNodeForInspectMode.clear();
         hideHighlight(errorString);
     }
 }
 
 PassOwnPtr<InspectorHighlightConfig> InspectorDOMAgent::highlightConfigFromInspectorObject(ErrorString* errorString, JSONObject* highlightInspectorObject)
 {
     if (!highlightInspectorObject) {
         *errorString = "Internal error: highlight configuration parameter is missing";
@@ skipping 999 matching lines @@
     visitor->trace(m_revalidateTask);
     visitor->trace(m_searchResults);
 #endif
     visitor->trace(m_hoveredNodeForInspectMode);
     visitor->trace(m_history);
     visitor->trace(m_domEditor);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink