Don't add duplicated line box rects into focus ring rects

Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 337 matching lines @@
 
     void setVisualViewportOffset(int x, int y);
 
     // Return true if the given use counter exists for the given document.
     // |useCounterId| must be one of the values from the UseCounter::Feature enum.
     bool isUseCounted(Document*, int useCounterId);
 
     String unscopeableAttribute();
     String unscopeableMethod();
 
+    ClientRectList* focusRingRects(Element*);
+
 private:
     explicit Internals(Document*);
     Document* contextDocument() const;
     LocalFrame* frame() const;
     Vector<String> iconURLs(Document*, int iconTypesMask) const;
     ClientRectList* annotatedRegions(Document*, bool draggable, ExceptionState&);
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     Member<InternalRuntimeFlags> m_runtimeFlags;
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // Internals_h