Add forEach() to CSSVariablesMap

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 3168 matching lines @@
     ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
     return false;
 }
 
 void CSSComputedStyleDeclaration::clearVariables(ExceptionState& es)
 {
     ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
     es.throwDOMException(NoModificationAllowedError, "Failed to clear variables from a computed 'CSSStyleDeclaration': computed styles are read-only.");
 }
 
+CSSComputedStyleDeclaration::ComputedCSSVariablesIterator::ComputedCSSVariablesIterator(const HashMap<AtomicString, String>* variables)
+    : m_active(variables)
+{
+    ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
+    if (m_active) {
+        m_it = variables->begin();
+        m_end = variables->end();
+    }
+}
+
+void CSSComputedStyleDeclaration::ComputedCSSVariablesIterator::advance()
+{
+    ASSERT(m_active);
+    ++m_it;
+    m_active = !atEnd();
+}
+
+AtomicString CSSComputedStyleDeclaration::ComputedCSSVariablesIterator::name() const
+{
+    ASSERT(m_active);
+    return m_it->key;
+}
+
+String CSSComputedStyleDeclaration::ComputedCSSVariablesIterator::value() const
+{
+    ASSERT(m_active);
+    return m_it->value;
+}
+
 PassRefPtr<CSSValueList> CSSComputedStyleDeclaration::valuesForBackgroundShorthand() const
 {
     static const CSSPropertyID propertiesBeforeSlashSeperator[5] = { CSSPropertyBackgroundColor, CSSPropertyBackgroundImage,
                                                                      CSSPropertyBackgroundRepeat, CSSPropertyBackgroundAttachment,
                                                                      CSSPropertyBackgroundPosition };
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore