1 files changed, 38 insertions, 0 deletions
diff --git a/xpcom/base/nsInterfaceRequestorAgg.h b/xpcom/base/nsInterfaceRequestorAgg.h
new file mode 100644
index 0000000000..62b4f61f93
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+++ b/xpcom/base/nsInterfaceRequestorAgg.h
@@ -0,0 +1,38 @@
+/* -*- 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 nsInterfaceRequestorAgg_h__
+#define nsInterfaceRequestorAgg_h__
+
+#include "nsError.h"
+
+class nsIEventTarget;
+class nsIInterfaceRequestor;
+
+/**
+ * This function returns an instance of nsIInterfaceRequestor that aggregates
+ * two nsIInterfaceRequestor instances.  Its GetInterface method queries
+ * aFirst for the requested interface and will query aSecond only if aFirst
+ * failed to supply the requested interface.  Both aFirst and aSecond may
+ * be null, and will be released on the main thread when the aggregator is
+ * destroyed.
+ */
+extern nsresult
+NS_NewInterfaceRequestorAggregation(nsIInterfaceRequestor* aFirst,
+                                    nsIInterfaceRequestor* aSecond,
+                                    nsIInterfaceRequestor** aResult);
+
+/**
+ * Like the previous method, but aFirst and aSecond will be released on the
+ * provided target thread.
+ */
+extern nsresult
+NS_NewInterfaceRequestorAggregation(nsIInterfaceRequestor* aFirst,
+                                    nsIInterfaceRequestor* aSecond,
+                                    nsIEventTarget* aTarget,
+                                    nsIInterfaceRequestor** aResult);
+
+#endif // !defined( nsInterfaceRequestorAgg_h__ )