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diff --git a/Source/WebCore/css/parser/CSSPropertyParserHelpers.h b/Source/WebCore/css/parser/CSSPropertyParserHelpers.h
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+// Copyright 2016 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 "CSSCustomIdentValue.h"
+#include "CSSFunctionValue.h"
+#include "CSSParserMode.h"
+#include "CSSParserTokenRange.h"
+#include "CSSPrimitiveValue.h"
+#include "CSSShadowValue.h"
+#include "CSSValuePool.h"
+#include "Length.h" // For ValueRange
+
+namespace WebCore {
+
+// When these functions are successful, they will consume all the relevant
+// tokens from the range and also consume any whitespace which follows. When
+// the start of the range doesn't match the type we're looking for, the range
+// will not be modified.
+namespace CSSPropertyParserHelpers {
+
+// FIXME: These should probably just be consumeComma and consumeSlash.
+bool consumeCommaIncludingWhitespace(CSSParserTokenRange&);
+bool consumeSlashIncludingWhitespace(CSSParserTokenRange&);
+// consumeFunction expects the range starts with a FunctionToken.
+CSSParserTokenRange consumeFunction(CSSParserTokenRange&);
+
+enum class UnitlessQuirk {
+    Allow,
+    Forbid
+};
+
+RefPtr<CSSPrimitiveValue> consumeInteger(CSSParserTokenRange&, double minimumValue = -std::numeric_limits<double>::max());
+bool consumePositiveIntegerRaw(CSSParserTokenRange&, int& result);
+RefPtr<CSSPrimitiveValue> consumePositiveInteger(CSSParserTokenRange&);
+bool consumeNumberRaw(CSSParserTokenRange&, double& result);
+RefPtr<CSSPrimitiveValue> consumeNumber(CSSParserTokenRange&, ValueRange);
+RefPtr<CSSPrimitiveValue> consumeLength(CSSParserTokenRange&, CSSParserMode, ValueRange, UnitlessQuirk = UnitlessQuirk::Forbid);
+RefPtr<CSSPrimitiveValue> consumePercent(CSSParserTokenRange&, ValueRange);
+RefPtr<CSSPrimitiveValue> consumeLengthOrPercent(CSSParserTokenRange&, CSSParserMode, ValueRange, UnitlessQuirk = UnitlessQuirk::Forbid);
+RefPtr<CSSPrimitiveValue> consumeAngle(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk = UnitlessQuirk::Forbid);
+RefPtr<CSSPrimitiveValue> consumeTime(CSSParserTokenRange&, CSSParserMode, ValueRange, UnitlessQuirk = UnitlessQuirk::Forbid);
+
+RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange&);
+RefPtr<CSSPrimitiveValue> consumeIdentRange(CSSParserTokenRange&, CSSValueID lower, CSSValueID upper);
+template<CSSValueID, CSSValueID...> inline bool identMatches(CSSValueID id);
+template<CSSValueID... allowedIdents> RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange&);
+
+RefPtr<CSSPrimitiveValue> consumeCustomIdent(CSSParserTokenRange&);
+RefPtr<CSSPrimitiveValue> consumeString(CSSParserTokenRange&);
+StringView consumeUrlAsStringView(CSSParserTokenRange&);
+RefPtr<CSSPrimitiveValue> consumeUrl(CSSParserTokenRange&);
+
+RefPtr<CSSPrimitiveValue> consumeColor(CSSParserTokenRange&, CSSParserMode, bool acceptQuirkyColors = false);
+
+RefPtr<CSSPrimitiveValue> consumePosition(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk);
+bool consumePosition(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY);
+bool consumeOneOrTwoValuedPosition(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY);
+
+enum class ConsumeGeneratedImage {
+    Allow,
+    Forbid
+};
+
+RefPtr<CSSValue> consumeImage(CSSParserTokenRange&, CSSParserContext, ConsumeGeneratedImage = ConsumeGeneratedImage::Allow);
+RefPtr<CSSValue> consumeImageOrNone(CSSParserTokenRange&, CSSParserContext);
+
+RefPtr<CSSValue> consumeFilter(CSSParserTokenRange&, const CSSParserContext&);
+RefPtr<CSSFunctionValue> consumeFilterFunction(CSSParserTokenRange&, const CSSParserContext&);
+RefPtr<CSSShadowValue> consumeSingleShadow(CSSParserTokenRange&, CSSParserMode, bool allowInset, bool allowSpread);
+
+// Template implementations are at the bottom of the file for readability.
+
+template<typename... emptyBaseCase> inline bool identMatches(CSSValueID) { return false; }
+template<CSSValueID head, CSSValueID... tail> inline bool identMatches(CSSValueID id)
+{
+    return id == head || identMatches<tail...>(id);
+}
+
+// FIXME-NEWPARSER - converted to a RefPtr return type from a raw ptr.
+template<CSSValueID... names> RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange& range)
+{
+    if (range.peek().type() != IdentToken || !identMatches<names...>(range.peek().id()))
+        return nullptr;
+    return CSSValuePool::singleton().createIdentifierValue(range.consumeIncludingWhitespace().id());
+}
+
+static inline bool isCSSWideKeyword(const CSSValueID& id)
+{
+    return id == CSSValueInitial || id == CSSValueInherit || id == CSSValueUnset || id == CSSValueRevert || id == CSSValueDefault;
+}
+
+} // namespace CSSPropertyParserHelpers
+
+} // namespace WebCore