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diff --git a/layout/style/StyleAnimationValue.h b/layout/style/StyleAnimationValue.h
new file mode 100644
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+++ b/layout/style/StyleAnimationValue.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/. */
+
+/* Utilities for animation of computed style values */
+
+#ifndef mozilla_StyleAnimationValue_h_
+#define mozilla_StyleAnimationValue_h_
+
+#include "mozilla/gfx/MatrixFwd.h"
+#include "mozilla/gfx/Point.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/ServoBindingTypes.h"
+#include "mozilla/ServoStyleConsts.h"  // Servo_AnimationValue_Dump
+#include "mozilla/DbgMacro.h"
+#include "nsStringFwd.h"
+#include "nsStringBuffer.h"
+#include "nsCoord.h"
+#include "nsColor.h"
+#include "nsCSSPropertyID.h"
+#include "nsCSSValue.h"
+#include "nsStyleConsts.h"
+#include "nsStyleTransformMatrix.h"
+
+class nsIFrame;
+class gfx3DMatrix;
+
+namespace mozilla {
+
+namespace css {
+class StyleRule;
+}  // namespace css
+
+namespace dom {
+class Element;
+}  // namespace dom
+
+namespace layers {
+class Animatable;
+}  // namespace layers
+
+enum class PseudoStyleType : uint8_t;
+struct PropertyStyleAnimationValuePair;
+
+struct AnimationValue {
+  explicit AnimationValue(const RefPtr<StyleAnimationValue>& aValue)
+      : mServo(aValue) {}
+  AnimationValue() = default;
+
+  AnimationValue(const AnimationValue& aOther) = default;
+  AnimationValue(AnimationValue&& aOther) = default;
+
+  AnimationValue& operator=(const AnimationValue& aOther) = default;
+  AnimationValue& operator=(AnimationValue&& aOther) = default;
+
+  bool operator==(const AnimationValue& aOther) const;
+  bool operator!=(const AnimationValue& aOther) const;
+
+  bool IsNull() const { return !mServo; }
+
+  float GetOpacity() const;
+
+  // Returns nscolor value in this AnimationValue.
+  // Currently only background-color is supported.
+  nscolor GetColor(nscolor aForegroundColor) const;
+
+  // Returns true if this AnimationValue is current-color.
+  // Currently only background-color is supported.
+  bool IsCurrentColor() const;
+
+  // Return a transform list for the transform property.
+  const mozilla::StyleTransform& GetTransformProperty() const;
+  const mozilla::StyleScale& GetScaleProperty() const;
+  const mozilla::StyleTranslate& GetTranslateProperty() const;
+  const mozilla::StyleRotate& GetRotateProperty() const;
+
+  // Motion path properties.
+  const mozilla::StyleOffsetPath& GetOffsetPathProperty() const;
+  const mozilla::LengthPercentage& GetOffsetDistanceProperty() const;
+  const mozilla::StyleOffsetRotate& GetOffsetRotateProperty() const;
+  const mozilla::StylePositionOrAuto& GetOffsetAnchorProperty() const;
+
+  // Return the scale for mServo, which is calculated with reference to aFrame.
+  mozilla::gfx::MatrixScales GetScaleValue(const nsIFrame* aFrame) const;
+
+  // Uncompute this AnimationValue and then serialize it.
+  void SerializeSpecifiedValue(nsCSSPropertyID aProperty,
+                               const StylePerDocumentStyleData* aRawData,
+                               nsACString& aString) const;
+
+  // Check if |*this| and |aToValue| can be interpolated.
+  bool IsInterpolableWith(nsCSSPropertyID aProperty,
+                          const AnimationValue& aToValue) const;
+
+  // Compute the distance between *this and aOther.
+  double ComputeDistance(nsCSSPropertyID aProperty,
+                         const AnimationValue& aOther) const;
+
+  // Create an AnimaitonValue from a string. This method flushes style, so we
+  // should use this carefully. Now, it is only used by
+  // nsDOMWindowUtils::ComputeAnimationDistance.
+  static AnimationValue FromString(nsCSSPropertyID aProperty,
+                                   const nsACString& aValue,
+                                   dom::Element* aElement);
+
+  // Create an already_AddRefed<StyleAnimationValue> from a
+  // layers::Animatable. Basically, this function should return AnimationValue,
+  // but it seems the caller, AnimationHelper, only needs
+  // StyleAnimationValue, so we return its already_AddRefed<> to avoid
+  // adding/removing a redundant ref-count.
+  static already_AddRefed<StyleAnimationValue> FromAnimatable(
+      nsCSSPropertyID aProperty, const layers::Animatable& aAnimatable);
+
+  RefPtr<StyleAnimationValue> mServo;
+};
+
+inline std::ostream& operator<<(std::ostream& aOut,
+                                const AnimationValue& aValue) {
+  MOZ_ASSERT(aValue.mServo);
+  nsAutoCString s;
+  Servo_AnimationValue_Dump(aValue.mServo, &s);
+  return aOut << s;
+}
+
+struct PropertyStyleAnimationValuePair {
+  nsCSSPropertyID mProperty;
+  AnimationValue mValue;
+};
+}  // namespace mozilla
+
+#endif