Fix focus ring damage sometimes being 1 pixel off.

third_party/WebKit/Source/core/style/StyleBackgroundData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 18 matching lines @@
 #include "core/style/OutlineValue.h"
 #include "platform/graphics/Color.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 // TODO(sashab): Move this into a private class on ComputedStyle, and remove
 // all methods on it, merging them into copy/creation methods on ComputedStyle
 // instead. Keep the allocation logic, only allocating a new object if needed.
-class StyleBackgroundData : public RefCounted<StyleBackgroundData> {
+class CORE_EXPORT StyleBackgroundData : public RefCounted<StyleBackgroundData> {
  public:
   static PassRefPtr<StyleBackgroundData> create() {
     return adoptRef(new StyleBackgroundData);
   }
   PassRefPtr<StyleBackgroundData> copy() const {
     return adoptRef(new StyleBackgroundData(*this));
   }
   ~StyleBackgroundData() {}
 
   bool operator==(const StyleBackgroundData&) const;
@@ skipping 12 matching lines @@
   StyleBackgroundData(const StyleBackgroundData&);
 
   FillLayer m_background;
   StyleColor m_color;
   OutlineValue m_outline;
 };
 
 }  // namespace blink
 
 #endif  // StyleBackgroundData_h