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diff --git a/layout/style/ServoCSSParser.h b/layout/style/ServoCSSParser.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* CSS parsing utility functions */
+
+#ifndef mozilla_ServoCSSParser_h
+#define mozilla_ServoCSSParser_h
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/gfx/Matrix.h"
+#include "mozilla/ServoTypes.h"
+#include "nsColor.h"
+#include "nsCSSPropertyID.h"
+#include "nsDOMCSSDeclaration.h"
+#include "nsStringFwd.h"
+
+struct nsCSSRect;
+template <class T>
+class RefPtr;
+
+namespace mozilla {
+
+class ServoStyleSet;
+struct URLExtraData;
+struct StyleFontFamilyList;
+struct StyleFontStretch;
+struct StyleFontWeight;
+struct StyleFontStyle;
+struct StyleLockedDeclarationBlock;
+union StyleComputedFontStyleDescriptor;
+
+template <typename Integer, typename Number, typename LinearStops>
+struct StyleTimingFunction;
+struct StylePiecewiseLinearFunction;
+using StyleComputedTimingFunction =
+    StyleTimingFunction<int32_t, float, StylePiecewiseLinearFunction>;
+
+namespace css {
+class Loader;
+}
+
+namespace dom {
+class Document;
+}
+
+class ServoCSSParser {
+ public:
+  using ParsingEnvironment = nsDOMCSSDeclaration::ParsingEnvironment;
+
+  /**
+   * Returns whether the specified string can be parsed as a valid CSS
+   * <color> value.
+   *
+   * This includes Mozilla-specific keywords such as -moz-default-color.
+   */
+  static bool IsValidCSSColor(const nsACString& aValue);
+
+  /**
+   * Computes an nscolor from the given CSS <color> value.
+   *
+   * @param aStyleSet The style set whose nsPresContext will be used to
+   *   compute system colors and other special color values.
+   * @param aCurrentColor The color value that currentcolor should compute to.
+   * @param aValue The CSS <color> value.
+   * @param aResultColor The resulting computed color value.
+   * @param aWasCurrentColor Whether aValue was currentcolor. Can be nullptr
+   *   if the caller doesn't care.
+   * @param aLoader The CSS loader for document we're parsing a color for,
+   *   so that parse errors can be reported to the console. If nullptr, errors
+   *   won't be reported to the console.
+   * @return Whether aValue was successfully parsed and aResultColor was set.
+   */
+  static bool ComputeColor(ServoStyleSet* aStyleSet, nscolor aCurrentColor,
+                           const nsACString& aValue, nscolor* aResultColor,
+                           bool* aWasCurrentColor = nullptr,
+                           css::Loader* aLoader = nullptr);
+
+  /**
+   * Parse a string representing a CSS property value into a
+   * StyleLockedDeclarationBlock.
+   *
+   * @param aProperty The property to be parsed.
+   * @param aValue The specified value.
+   * @param aParsingEnvironment All the parsing environment data we need.
+   * @param aParsingMode The paring mode we apply.
+   * @return The parsed value as a StyleLockedDeclarationBlock. We put the value
+   *   in a declaration block since that is how we represent specified values
+   *   in Servo.
+   */
+  static already_AddRefed<StyleLockedDeclarationBlock> ParseProperty(
+      nsCSSPropertyID aProperty, const nsACString& aValue,
+      const ParsingEnvironment& aParsingEnvironment,
+      ParsingMode aParsingMode = ParsingMode::Default);
+
+  /**
+   * Parse a animation timing function.
+   *
+   * @param aValue The specified value.
+   * @param aResult The output timing function. (output)
+   * @return Whether the value was successfully parsed.
+   */
+  static bool ParseEasing(const nsACString& aValue,
+                          StyleComputedTimingFunction& aResult);
+
+  /**
+   * Parse a specified transform list into a gfx matrix.
+   *
+   * @param aValue The specified value.
+   * @param aContains3DTransform The output flag indicates whether this is any
+   *   3d transform function. (output)
+   * @param aResult The output matrix. (output)
+   * @return Whether the value was successfully parsed.
+   */
+  static bool ParseTransformIntoMatrix(const nsACString& aValue,
+                                       bool& aContains3DTransform,
+                                       gfx::Matrix4x4& aResult);
+
+  /**
+   * Parse a font shorthand for FontFaceSet matching, so we only care about
+   * FontFamily, FontStyle, FontStretch, and FontWeight.
+   *
+   * @param aValue The specified value.
+   * @param aUrl The parser url extra data.
+   * @param aList The parsed FontFamily list. (output)
+   * @param aStyle The parsed FontStyle. (output)
+   * @param aStretch The parsed FontStretch. (output)
+   * @param aWeight The parsed FontWeight. (output)
+   * @param aSize If non-null, returns the parsed font size. (output)
+   * @return Whether the value was successfully parsed.
+   */
+  static bool ParseFontShorthandForMatching(
+      const nsACString& aValue, URLExtraData* aUrl, StyleFontFamilyList& aList,
+      StyleFontStyle& aStyle, StyleFontStretch& aStretch,
+      StyleFontWeight& aWeight, float* aSize = nullptr);
+
+  /**
+   * Get a URLExtraData from a document.
+   */
+  static already_AddRefed<URLExtraData> GetURLExtraData(dom::Document*);
+
+  /**
+   * Get a ParsingEnvironment from a document.
+   */
+  static ParsingEnvironment GetParsingEnvironment(dom::Document*);
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_ServoCSSParser_h