Devtools [LayoutEditor]: show selector info and highlight affected nodes

Source/core/inspector/InspectorOverlayHost.cpp

 /*
  * 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:
  *
  * 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 59 matching lines @@
     if (m_listener)
         m_listener->overlayEndedPropertyChange();
 }
 
 void InspectorOverlayHost::clearSelection(bool commitChanges)
 {
     if (m_listener)
         m_listener->overlayClearSelection(commitChanges);
 }
 
+void InspectorOverlayHost::nextSelector()
+{
+    if (m_listener)
+        m_listener->overlayNextSelector();
+}
+
+void InspectorOverlayHost::previousSelector()
+{
+    if (m_listener)
+        m_listener->overlayPreviousSelector();
+}
+
+String InspectorOverlayHost::currentSelectorInfo()
+{
+    if (m_listener)
+        return m_listener->overlayCurrentSelectorInfo();
+
+    return String();
+}
+
 DEFINE_TRACE(InspectorOverlayHost)
 {
     visitor->trace(m_listener);
 }
 
 } // namespace blink