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

Source/web/InspectorOverlayImpl.h

 /*
  * 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 80 matching lines @@
     class InspectorOverlayChromeClient;
     class InspectorPageOverlayDelegate;
 
     // InspectorOverlayHost::Listener implementation.
     void overlayResumed() override;
     void overlaySteppedOver() override;
     void overlayStartedPropertyChange(const String&) override;
     void overlayPropertyChanged(float) override;
     void overlayEndedPropertyChange() override;
     void overlayClearSelection(bool) override;
+    void overlayNextSelector() override;
+    void overlayPreviousSelector() override;
+    String overlayCurrentSelectorInfo() override;
 
     // InspectorProfilerAgent::Client implementation.
     void profilingStarted() override;
     void profilingStopped() override;
 
     // InspectorPageAgent::Client implementation.
     void pageLayoutInvalidated(bool resized) override;
     void setShowViewportSizeOnResize(bool show, bool showGrid) override;
     void setPausedInDebuggerMessage(const String*) override;
 
@@ skipping 51 matching lines @@
     RefPtrWillBeMember<Node> m_hoveredNodeForInspectMode;
     InspectorDOMAgent::SearchMode m_inspectMode;
     OwnPtr<InspectorHighlightConfig> m_inspectModeHighlightConfig;
     bool m_searchingInLayoutEditor;
 };
 
 } // namespace blink
 
 
 #endif // InspectorOverlayImpl_h