diff -r 000000000000 -r 6474c204b198 accessible/src/windows/msaa/EnumVariant.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/windows/msaa/EnumVariant.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,99 @@
+/* -*- 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/. */
+
+#include "EnumVariant.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// ChildrenEnumVariant
+////////////////////////////////////////////////////////////////////////////////
+
+IMPL_IUNKNOWN_QUERY_HEAD(ChildrenEnumVariant)
+IMPL_IUNKNOWN_QUERY_IFACE(IEnumVARIANT);
+IMPL_IUNKNOWN_QUERY_IFACE(IUnknown);
+IMPL_IUNKNOWN_QUERY_AGGR_COND(mAnchorAcc, !mAnchorAcc->IsDefunct());
+IMPL_IUNKNOWN_QUERY_TAIL
+
+STDMETHODIMP
+ChildrenEnumVariant::Next(ULONG aCount, VARIANT FAR* aItems,
+                          ULONG FAR* aCountFetched)
+{
+  A11Y_TRYBLOCK_BEGIN
+
+  if (!aItems || !aCountFetched)
+    return E_INVALIDARG;
+
+  *aCountFetched = 0;
+
+  if (mAnchorAcc->IsDefunct() || mAnchorAcc->GetChildAt(mCurIndex) != mCurAcc)
+    return CO_E_OBJNOTCONNECTED;
+
+  ULONG countFetched = 0;
+  for (; mCurAcc && countFetched < aCount; countFetched++) {
+    VariantInit(aItems + countFetched);
+    aItems[countFetched].pdispVal = AccessibleWrap::NativeAccessible(mCurAcc);
+    aItems[countFetched].vt = VT_DISPATCH;
+
+    mCurIndex++;
+    mCurAcc = mAnchorAcc->GetChildAt(mCurIndex);
+  }
+
+  (*aCountFetched) = countFetched;
+
+  return countFetched < aCount ? S_FALSE : S_OK;
+
+  A11Y_TRYBLOCK_END
+}
+
+STDMETHODIMP
+ChildrenEnumVariant::Skip(ULONG aCount)
+{
+  A11Y_TRYBLOCK_BEGIN
+
+  if (mAnchorAcc->IsDefunct() || mAnchorAcc->GetChildAt(mCurIndex) != mCurAcc)
+    return CO_E_OBJNOTCONNECTED;
+
+  mCurIndex += aCount;
+  mCurAcc = mAnchorAcc->GetChildAt(mCurIndex);
+
+  return mCurAcc ? S_OK : S_FALSE;
+
+  A11Y_TRYBLOCK_END
+}
+
+STDMETHODIMP
+ChildrenEnumVariant::Reset()
+{
+  A11Y_TRYBLOCK_BEGIN
+
+  if (mAnchorAcc->IsDefunct())
+    return CO_E_OBJNOTCONNECTED;
+
+  mCurIndex = 0;
+  mCurAcc = mAnchorAcc->GetChildAt(0);
+
+  return S_OK;
+
+  A11Y_TRYBLOCK_END
+}
+
+STDMETHODIMP
+ChildrenEnumVariant::Clone(IEnumVARIANT** aEnumVariant)
+{
+  A11Y_TRYBLOCK_BEGIN
+
+  if (!aEnumVariant)
+    return E_INVALIDARG;
+
+  *aEnumVariant = new ChildrenEnumVariant(*this);
+  (*aEnumVariant)->AddRef();
+
+  return S_OK;
+
+  A11Y_TRYBLOCK_END
+}