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

Source/core/testing/Internals.cpp

 /*
  * 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 2346 matching lines @@
 String Internals::unscopeableAttribute()
 {
     return "unscopeableAttribute";
 }
 
 String Internals::unscopeableMethod()
 {
     return "unscopeableMethod";
 }
 
+ClientRectList* Internals::focusRingRects(Element* element)
+{
+    Vector<LayoutRect> rects;
+    if (element && element->layoutObject())
+        element->layoutObject()->addFocusRingRects(rects, LayoutPoint());
+    return ClientRectList::create(rects);
+}
+
 } // namespace blink