Devtools[LayoutEditor]: Pass data about property change from InspectorOverlayPage

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 65 matching lines @@
     void setPausedInDebuggerMessage(const String*) override;
     void setInspectModeEnabled(bool) override;
     void hideHighlight() override;
     void highlightNode(Node*, Node* eventTarget, const InspectorHighlightConfig&, bool omitTooltip) override;
     void highlightQuad(PassOwnPtr<FloatQuad>, const InspectorHighlightConfig&) override;
     void showAndHideViewSize(bool showGrid) override;
     void setListener(InspectorOverlay::Listener* listener) override { m_listener = listener; }
     void suspendUpdates() override;
     void resumeUpdates() override;
     void clear() override;
+    LayoutEditor* layoutEditor() override { return m_layoutEditor.get(); }
 
     bool handleInputEvent(const WebInputEvent&);
     void invalidate();
 private:
     explicit InspectorOverlayImpl(WebViewImpl*);
 
     // InspectorOverlayHost::Listener implementation.
     void overlayResumed() override;
     void overlaySteppedOver() override;
 
@@ skipping 31 matching lines @@
     int m_suspendCount;
     bool m_updating;
     RawPtrWillBeMember<InspectorOverlay::Listener> m_listener;
     OwnPtrWillBeMember<LayoutEditor> m_layoutEditor;
 };
 
 } // namespace blink
 
 
 #endif // InspectorOverlayImpl_h