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diff --git a/dom/svg/DOMSVGTransform.h b/dom/svg/DOMSVGTransform.h
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+++ b/dom/svg/DOMSVGTransform.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 DOM_SVG_DOMSVGTRANSFORM_H_
+#define DOM_SVG_DOMSVGTRANSFORM_H_
+
+#include "DOMSVGTransformList.h"
+#include "gfxMatrix.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsDebug.h"
+#include "nsID.h"
+#include "SVGTransform.h"
+#include "nsWrapperCache.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+
+#define MOZ_SVG_LIST_INDEX_BIT_COUNT 31  // supports > 2 billion list items
+
+namespace mozilla {
+namespace dom {
+
+struct DOMMatrix2DInit;
+class SVGElement;
+class SVGMatrix;
+
+/**
+ * DOM wrapper for an SVG transform. See DOMSVGLength.h.
+ */
+class DOMSVGTransform final : public nsWrapperCache {
+  template <class T>
+  friend class AutoChangeTransformListNotifier;
+
+ public:
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(DOMSVGTransform)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(DOMSVGTransform)
+
+  /**
+   * Generic ctor for DOMSVGTransform objects that are created for an attribute.
+   */
+  DOMSVGTransform(DOMSVGTransformList* aList, uint32_t aListIndex,
+                  bool aIsAnimValItem);
+
+  /**
+   * Ctors for creating the objects returned by:
+   *   SVGSVGElement.createSVGTransform(),
+   *   SVGSVGElement.createSVGTransformFromMatrix(in DOMMatrix2DInit  matrix),
+   *   SVGTransformList.createSVGTransformFromMatrix(in DOMMatrix2DInit  matrix)
+   * which do not initially belong to an attribute.
+   */
+  DOMSVGTransform();
+  explicit DOMSVGTransform(const gfxMatrix& aMatrix);
+  DOMSVGTransform(const DOMMatrix2DInit& aMatrix, ErrorResult& rv);
+
+  /**
+   * Ctor for creating an unowned copy. Used with Clone().
+   */
+  explicit DOMSVGTransform(const SVGTransform& aTransform);
+
+  /**
+   * Create an unowned copy of an owned transform. The caller is responsible for
+   * the first AddRef().
+   */
+  DOMSVGTransform* Clone() {
+    NS_ASSERTION(mList, "unexpected caller");
+    return new DOMSVGTransform(InternalItem());
+  }
+
+  bool IsInList() const { return !!mList; }
+
+  /**
+   * Returns true if our attribute is animating (in which case our animVal is
+   * not simply a mirror of our baseVal).
+   */
+  bool IsAnimating() const { return mList && mList->IsAnimating(); }
+
+  /**
+   * In future, if this class is used for non-list transforms, this will be
+   * different to IsInList().
+   */
+  bool HasOwner() const { return !!mList; }
+
+  /**
+   * This method is called to notify this DOM object that it is being inserted
+   * into a list, and give it the information it needs as a result.
+   *
+   * This object MUST NOT already belong to a list when this method is called.
+   * That's not to say that script can't move these DOM objects between
+   * lists - it can - it's just that the logic to handle that (and send out
+   * the necessary notifications) is located elsewhere (in
+   * DOMSVGTransformList).)
+   */
+  void InsertingIntoList(DOMSVGTransformList* aList, uint32_t aListIndex,
+                         bool aIsAnimValItem);
+
+  static uint32_t MaxListIndex() {
+    return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;
+  }
+
+  /// This method is called to notify this object that its list index changed.
+  void UpdateListIndex(uint32_t aListIndex) { mListIndex = aListIndex; }
+
+  /**
+   * This method is called to notify this DOM object that it is about to be
+   * removed from its current DOM list so that it can first make a copy of its
+   * internal counterpart's values. (If it didn't do this, then it would
+   * "lose" its value on being removed.)
+   */
+  void RemovingFromList();
+
+  SVGTransform ToSVGTransform() const { return Transform(); }
+
+  // WebIDL
+  DOMSVGTransformList* GetParentObject() const { return mList; }
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+  uint16_t Type() const;
+  dom::SVGMatrix* GetMatrix();
+  float Angle() const;
+  void SetMatrix(const DOMMatrix2DInit& matrix, ErrorResult& rv);
+  void SetTranslate(float tx, float ty, ErrorResult& rv);
+  void SetScale(float sx, float sy, ErrorResult& rv);
+  void SetRotate(float angle, float cx, float cy, ErrorResult& rv);
+  void SetSkewX(float angle, ErrorResult& rv);
+  void SetSkewY(float angle, ErrorResult& rv);
+
+ protected:
+  ~DOMSVGTransform();
+
+  // Interface for SVGMatrix's use
+  friend class dom::SVGMatrix;
+  bool IsAnimVal() const { return mIsAnimValItem; }
+  const gfxMatrix& Matrixgfx() const { return Transform().GetMatrix(); }
+  void SetMatrix(const gfxMatrix& aMatrix);
+
+ private:
+  SVGElement* Element() { return mList->Element(); }
+
+  /**
+   * Get a reference to the internal SVGTransform list item that this DOM
+   * wrapper object currently wraps.
+   */
+  SVGTransform& InternalItem();
+  const SVGTransform& InternalItem() const;
+
+#ifdef DEBUG
+  bool IndexIsValid();
+#endif
+
+  const SVGTransform& Transform() const {
+    return HasOwner() ? InternalItem() : *mTransform;
+  }
+  SVGTransform& Transform() {
+    return HasOwner() ? InternalItem() : *mTransform;
+  }
+
+  RefPtr<DOMSVGTransformList> mList;
+
+  // Bounds for the following are checked in the ctor, so be sure to update
+  // that if you change the capacity of any of the following.
+
+  uint32_t mListIndex : MOZ_SVG_LIST_INDEX_BIT_COUNT;
+  uint32_t mIsAnimValItem : 1;
+
+  // Usually this class acts as a wrapper for an SVGTransform object which is
+  // part of a list and is accessed by going via the owning Element.
+  //
+  // However, in some circumstances, objects of this class may not be associated
+  // with any particular list and thus, no internal SVGTransform object. In
+  // that case we allocate an SVGTransform object on the heap to store the
+  // data.
+  UniquePtr<SVGTransform> mTransform;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
+
+#endif  // DOM_SVG_DOMSVGTRANSFORM_H_