Add forEach() to CSSVariablesMap

Source/core/css/PropertySetCSSStyleDeclaration.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  *
  * 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.
  *
@@ skipping 301 matching lines @@
 {
     ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
     StyleAttributeMutationScope mutationScope(this);
     willMutate();
     bool changed = m_propertySet->clearVariables();
     didMutate(changed ? PropertyChanged : NoChanges);
     if (changed)
         mutationScope.enqueueMutationRecord();
 }
 
+PassRefPtr<CSSVariablesIterator> PropertySetCSSStyleDeclaration::variablesIterator() const
+{
+    return m_propertySet->variablesIterator();
+}
+
 CSSValue* PropertySetCSSStyleDeclaration::cloneAndCacheForCSSOM(CSSValue* internalValue)
 {
     if (!internalValue)
         return 0;
 
     // The map is here to maintain the object identity of the CSSValues over multiple invocations.
     // FIXME: It is likely that the identity is not important for web compatibility and this code should be removed.
     if (!m_cssomCSSValueClones)
         m_cssomCSSValueClones = adoptPtr(new HashMap<CSSValue*, RefPtr<CSSValue> >);
 
@@ skipping 87 matching lines @@
     m_parentElement->invalidateStyleAttribute();
     StyleAttributeMutationScope(this).didInvalidateStyleAttr();
 }
 
 CSSStyleSheet* InlineCSSStyleDeclaration::parentStyleSheet() const
 {
     return m_parentElement ? m_parentElement->document()->elementSheet() : 0;
 }
 
 } // namespace WebCore