Make anchors mouse-focusable

Source/core/dom/ElementData.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 71 matching lines @@
     void traceAfterDispatch(Visitor*);
     void trace(Visitor*);
 
 protected:
     ElementData();
     explicit ElementData(unsigned arraySize);
     ElementData(const ElementData&, bool isUnique);
 
     // Keep the type in a bitfield instead of using virtual destructors to avoid adding a vtable.
     unsigned m_isUnique : 1;
-    unsigned m_arraySize : 28;
+    unsigned m_arraySize : 19;

[pdr., 2014/08/25 22:57:37]

You cannot just take 9 bits off m_arraySize :)

It looks like we will need to find an extra bit elsewhere.

[robwu, 2014/08/25 23:14:58]

Oops, should have removed only one bit. 28 -> 27 is fine, right?

     mutable unsigned m_presentationAttributeStyleIsDirty : 1;
     mutable unsigned m_styleAttributeIsDirty : 1;
     mutable unsigned m_animatedSVGAttributesAreDirty : 1;
+    // Whether an element whose mouse focus ring is hidden by default should be rendered with a focus ring on mouse focus.
+    bool m_shouldHideFocusRingOnMouseFocus : 1;
 
     mutable RefPtrWillBeMember<StylePropertySet> m_inlineStyle;
     mutable SpaceSplitString m_classNames;
     mutable AtomicString m_idForStyleResolution;
 
 private:
     friend class Element;
     friend class ShareableElementData;
     friend class UniqueElementData;
     friend class SVGElement;
@@ skipping 113 matching lines @@
 }
 
 inline MutableAttributeCollection UniqueElementData::attributes()
 {
     return MutableAttributeCollection(m_attributeVector);
 }
 
 } // namespace blink
 
 #endif // ElementData_h