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diff --git a/gfx/layers/LayerUserData.h b/gfx/layers/LayerUserData.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 GFX_LAYERUSERDATA_H
+#define GFX_LAYERUSERDATA_H
+
+namespace mozilla {
+namespace layers {
+
+/**
+ * Base class for userdata objects attached to layers and layer managers.
+ *
+ * We define it here in a separate header so clients only need to include
+ * this header for their class definitions, rather than pulling in Layers.h.
+ * Everything else in Layers.h should be forward-declarable.
+ */
+class LayerUserData {
+public:
+ virtual ~LayerUserData() {}
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif /* GFX_LAYERUSERDATA_H */