Added UseCounter for clearing browsing context name on cross-origin name

third_party/WebKit/Source/core/page/FrameTree.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 18 matching lines @@
 class Frame;
 
 class CORE_EXPORT FrameTree final {
   WTF_MAKE_NONCOPYABLE(FrameTree);
   DISALLOW_NEW();
 
  public:
   explicit FrameTree(Frame* thisFrame);
   ~FrameTree();
 
-  const AtomicString& name() const { return m_name; }
+  const AtomicString& name() const;
   void setName(const AtomicString&);
 
+  // TODO(andypaicu): remove this once we have gathered the data
+  void experimentalSetNulledName();
+
   Frame* parent() const;
   Frame* top() const;
   Frame* nextSibling() const;
   Frame* firstChild() const;
 
   bool isDescendantOf(const Frame* ancestor) const;
   Frame* traverseNext(const Frame* stayWithin = nullptr) const;
 
   Frame* find(const AtomicString& name) const;
   unsigned childCount() const;
 
   Frame* scopedChild(unsigned index) const;
   Frame* scopedChild(const AtomicString& name) const;
   unsigned scopedChildCount() const;
   void invalidateScopedChildCount();
 
   DECLARE_TRACE();
 
  private:
   Member<Frame> m_thisFrame;
 
   AtomicString m_name;  // The actual frame name (may be empty).
 
   mutable unsigned m_scopedChildCount;
+
+  // TODO(andypaicu): remove this once we have gathered the data
+  bool m_experimentalSetNulledName;
 };
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showFrameTree(const blink::Frame*);
 #endif
 
 #endif  // FrameTree_h