diff -r 000000000000 -r 6474c204b198 accessible/src/windows/msaa/EnumVariant.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/windows/msaa/EnumVariant.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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_a11y_EnumVariant_h__
+#define mozilla_a11y_EnumVariant_h__
+
+#include "AccessibleWrap.h"
+#include "IUnknownImpl.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used to fetch accessible children.
+ */
+class ChildrenEnumVariant MOZ_FINAL : public IEnumVARIANT
+{
+public:
+  ChildrenEnumVariant(AccessibleWrap* aAnchor) : mAnchorAcc(aAnchor),
+    mCurAcc(mAnchorAcc->GetChildAt(0)), mCurIndex(0) { }
+
+  // IUnknown
+  DECL_IUNKNOWN
+
+  // IEnumVariant
+  virtual /* [local] */ HRESULT STDMETHODCALLTYPE Next(
+    /* [in] */ ULONG aCount,
+    /* [length_is][size_is][out] */ VARIANT* aItems,
+    /* [out] */ ULONG* aCountFetched);
+
+  virtual HRESULT STDMETHODCALLTYPE Skip(
+    /* [in] */ ULONG aCount);
+
+  virtual HRESULT STDMETHODCALLTYPE Reset();
+
+  virtual HRESULT STDMETHODCALLTYPE Clone(
+    /* [out] */ IEnumVARIANT** aEnumVaraint);
+
+private:
+  ChildrenEnumVariant() MOZ_DELETE;
+  ChildrenEnumVariant& operator =(const ChildrenEnumVariant&) MOZ_DELETE;
+
+  ChildrenEnumVariant(const ChildrenEnumVariant& aEnumVariant) :
+    mAnchorAcc(aEnumVariant.mAnchorAcc), mCurAcc(aEnumVariant.mCurAcc),
+    mCurIndex(aEnumVariant.mCurIndex) { }
+  virtual ~ChildrenEnumVariant() { }
+
+protected:
+  nsRefPtr<AccessibleWrap> mAnchorAcc;
+  Accessible* mCurAcc;
+  uint32_t mCurIndex;
+};
+
+} // a11y namespace
+} // mozilla namespace
+
+#endif