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diff --git a/gfx/layers/AnimationStorageData.h b/gfx/layers/AnimationStorageData.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/. */
+
+#ifndef mozilla_layers_AnimationStorageData_h
+#define mozilla_layers_AnimationStorageData_h
+
+#include "mozilla/dom/Nullable.h"
+#include "mozilla/ComputedTimingFunction.h"  // for ComputedTimingFunction
+#include "mozilla/layers/LayersMessages.h"   // for TransformData, etc
+#include "mozilla/layers/LayersTypes.h"      // for LayersId
+#include "mozilla/TimeStamp.h"               // for TimeStamp
+#include "mozilla/TimingParams.h"
+#include "X11UndefineNone.h"
+
+namespace mozilla {
+
+namespace dom {
+enum class CompositeOperation : uint8_t;
+enum class IterationCompositeOperation : uint8_t;
+};  // namespace dom
+
+namespace layers {
+
+struct PropertyAnimation {
+  struct SegmentData {
+    RefPtr<RawServoAnimationValue> mStartValue;
+    RefPtr<RawServoAnimationValue> mEndValue;
+    Maybe<mozilla::ComputedTimingFunction> mFunction;
+    float mStartPortion;
+    float mEndPortion;
+    dom::CompositeOperation mStartComposite;
+    dom::CompositeOperation mEndComposite;
+  };
+  nsTArray<SegmentData> mSegments;
+  TimingParams mTiming;
+
+  // These two variables correspond to the variables of the same name in
+  // KeyframeEffectReadOnly and are used for the same purpose: to skip composing
+  // animations whose progress has not changed.
+  dom::Nullable<double> mProgressOnLastCompose;
+  uint64_t mCurrentIterationOnLastCompose = 0;
+  // These two variables are used for a similar optimization above but are
+  // applied to the timing function in each keyframe.
+  uint32_t mSegmentIndexOnLastCompose = 0;
+  dom::Nullable<double> mPortionInSegmentOnLastCompose;
+
+  TimeStamp mOriginTime;
+  Maybe<TimeDuration> mStartTime;
+  TimeDuration mHoldTime;
+  float mPlaybackRate;
+  dom::IterationCompositeOperation mIterationComposite;
+  bool mIsNotPlaying;
+
+  void ResetLastCompositionValues() {
+    mCurrentIterationOnLastCompose = 0;
+    mSegmentIndexOnLastCompose = 0;
+    mProgressOnLastCompose.SetNull();
+    mPortionInSegmentOnLastCompose.SetNull();
+  }
+};
+
+struct PropertyAnimationGroup {
+  nsCSSPropertyID mProperty;
+
+  nsTArray<PropertyAnimation> mAnimations;
+  RefPtr<RawServoAnimationValue> mBaseStyle;
+
+  bool IsEmpty() const { return mAnimations.IsEmpty(); }
+  void Clear() {
+    mAnimations.Clear();
+    mBaseStyle = nullptr;
+  }
+  void ResetLastCompositionValues() {
+    for (PropertyAnimation& animation : mAnimations) {
+      animation.ResetLastCompositionValues();
+    }
+  }
+};
+
+struct AnimationStorageData {
+  // Each entry in the array represents an animation list for one property.  For
+  // transform-like properties (e.g. transform, rotate etc.), there may be
+  // multiple entries depending on how many transform-like properties we have.
+  nsTArray<PropertyAnimationGroup> mAnimation;
+  Maybe<TransformData> mTransformData;
+  // For motion path. We cached the gfx path for optimization.
+  RefPtr<gfx::Path> mCachedMotionPath;
+  // This is used to communicate with the main-thread. E.g. to tell the fact
+  // that this animation needs to be pre-rendered again on the main-thread, etc.
+  LayersId mLayersId;
+
+  AnimationStorageData() = default;
+  AnimationStorageData(AnimationStorageData&& aOther) = default;
+  AnimationStorageData& operator=(AnimationStorageData&& aOther) = default;
+
+  // Avoid any copy because mAnimation could be a large array.
+  AnimationStorageData(const AnimationStorageData& aOther) = delete;
+  AnimationStorageData& operator=(const AnimationStorageData& aOther) = delete;
+
+  bool IsEmpty() const { return mAnimation.IsEmpty(); }
+  void Clear() {
+    mAnimation.Clear();
+    mTransformData.reset();
+    mCachedMotionPath = nullptr;
+  }
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_AnimationStorageData_h