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diff --git a/Source/WebCore/css/CSSVariableData.h b/Source/WebCore/css/CSSVariableData.h
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+++ b/Source/WebCore/css/CSSVariableData.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Copyright (C) 2016 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.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include "CSSParserToken.h"
+#include "CSSParserTokenRange.h"
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class CSSParserTokenRange;
+
+class CSSVariableData : public RefCounted<CSSVariableData> {
+    WTF_MAKE_NONCOPYABLE(CSSVariableData);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static Ref<CSSVariableData> create(const CSSParserTokenRange& range, bool needsVariableResolution = true)
+    {
+        return adoptRef(*new CSSVariableData(range, needsVariableResolution));
+    }
+
+    static Ref<CSSVariableData> createResolved(const Vector<CSSParserToken>& resolvedTokens, const CSSVariableData& unresolvedData)
+    {
+        return adoptRef(*new CSSVariableData(resolvedTokens, unresolvedData.m_backingString));
+    }
+
+    CSSParserTokenRange tokenRange() { return m_tokens; }
+
+    const Vector<CSSParserToken>& tokens() const { return m_tokens; }
+
+    bool operator==(const CSSVariableData& other) const;
+
+    bool needsVariableResolution() const { return m_needsVariableResolution; }
+
+    bool checkVariablesForCycles(const AtomicString& name, CustomPropertyValueMap&, HashSet<AtomicString>& seenProperties, HashSet<AtomicString>& invalidProperties) const;
+
+    RefPtr<CSSVariableData> resolveVariableReferences(const CustomPropertyValueMap& customProperties) const;
+    bool resolveTokenRange(const CustomPropertyValueMap&, CSSParserTokenRange, Vector<CSSParserToken>&) const;
+
+private:
+    CSSVariableData(const CSSParserTokenRange&, bool needsVariableResolution);
+
+    // We can safely copy the tokens (which have raw pointers to substrings) because
+    // StylePropertySets contain references to CSSCustomPropertyValues, which
+    // point to the unresolved CSSVariableData values that own the backing strings
+    // this will potentially reference.
+    CSSVariableData(const Vector<CSSParserToken>& resolvedTokens, String backingString)
+        : m_backingString(backingString)
+        , m_tokens(resolvedTokens)
+        , m_needsVariableResolution(false)
+    { }
+
+    void consumeAndUpdateTokens(const CSSParserTokenRange&);
+    template<typename CharacterType> void updateTokens(const CSSParserTokenRange&);
+    
+    bool checkVariablesForCyclesWithRange(CSSParserTokenRange, CustomPropertyValueMap&, HashSet<AtomicString>& seenProperties, HashSet<AtomicString>& invalidProperties) const;
+    bool resolveVariableReference(const CustomPropertyValueMap&, CSSParserTokenRange, Vector<CSSParserToken>&) const;
+    bool resolveVariableFallback(const CustomPropertyValueMap&, CSSParserTokenRange, Vector<CSSParserToken>&) const;
+
+    String m_backingString;
+    Vector<CSSParserToken> m_tokens;
+    const bool m_needsVariableResolution;
+
+    // FIXME-NEWPARSER: We want to cache StyleProperties once we support @apply.
+};
+
+} // namespace WebCore