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diff --git a/dom/bindings/CallbackInterface.h b/dom/bindings/CallbackInterface.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/. */
+
+/**
+ * A common base class for representing WebIDL callback interface types in C++.
+ *
+ * This class implements common functionality like lifetime management,
+ * initialization with the callback object, and setup of the call environment.
+ * Subclasses corresponding to particular callback interface types should
+ * provide methods that actually do the various necessary calls.
+ */
+
+#ifndef mozilla_dom_CallbackInterface_h
+#define mozilla_dom_CallbackInterface_h
+
+#include "mozilla/dom/CallbackObject.h"
+
+namespace mozilla {
+namespace dom {
+
+class CallbackInterface : public CallbackObject
+{
+public:
+  // See CallbackObject for an explanation of the arguments.
+  explicit CallbackInterface(JSContext* aCx, JS::Handle<JSObject*> aCallback,
+                             nsIGlobalObject* aIncumbentGlobal)
+    : CallbackObject(aCx, aCallback, aIncumbentGlobal)
+  {
+  }
+
+  // See CallbackObject for an explanation of the arguments.
+  explicit CallbackInterface(JS::Handle<JSObject*> aCallback,
+                             JS::Handle<JSObject*> aAsyncStack,
+                             nsIGlobalObject* aIncumbentGlobal)
+    : CallbackObject(aCallback, aAsyncStack, aIncumbentGlobal)
+  {
+  }
+
+protected:
+  bool GetCallableProperty(JSContext* cx, JS::Handle<jsid> aPropId,
+                           JS::MutableHandle<JS::Value> aCallable);
+
+  // See CallbackObject for an explanation of the arguments.
+  CallbackInterface(JSContext* aCx, JS::Handle<JSObject*> aCallable,
+                    nsIGlobalObject* aIncumbentGlobal,
+                    const FastCallbackConstructor&)
+    : CallbackObject(aCx, aCallable, aIncumbentGlobal,
+                     FastCallbackConstructor())
+  {
+  }
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_CallbackFunction_h