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+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsISupports.idl"
+
+interface nsISimpleEnumerator;
+interface nsIURI;
+
+/**
+ * The chrome registry implements this interface to give overlays
+ * to the gecko XUL engine.
+ */
+
+[scriptable, uuid(1d5b5b94-dc47-4050-93b7-ac092e383cad)]
+interface nsIXULOverlayProvider : nsISupports
+{
+ /**
+ * Get the XUL overlays for a particular chrome URI.
+ *
+ * @param aURI The URI being loaded
+ * @return An enumerator of nsIURI for the overlays of this URI
+ */
+ nsISimpleEnumerator /*nsIURI*/ getXULOverlays(in nsIURI aURI);
+
+ /**
+ * Get the style overlays for a particular chrome URI.
+ *
+ * @param aURI The URI being loaded
+ * @return An enumerator of nsIURI for the overlays of this URI
+ */
+ nsISimpleEnumerator /*nsIURI*/ getStyleOverlays(in nsIURI aURI);
+};