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diff --git a/dom/bindings/CallbackFunction.h b/dom/bindings/CallbackFunction.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 function types in C++.
+ *
+ * This class implements common functionality like lifetime
+ * management, initialization with the callable, and setup of the call
+ * environment.  Subclasses corresponding to particular callback
+ * function types should provide a Call() method that actually does
+ * the call.
+ */
+
+#ifndef mozilla_dom_CallbackFunction_h
+#define mozilla_dom_CallbackFunction_h
+
+#include "mozilla/dom/CallbackObject.h"
+
+namespace mozilla {
+namespace dom {
+
+class CallbackFunction : public CallbackObject
+{
+public:
+  // See CallbackObject for an explanation of the arguments.
+  explicit CallbackFunction(JSContext* aCx, JS::Handle<JSObject*> aCallable,
+                            nsIGlobalObject* aIncumbentGlobal)
+    : CallbackObject(aCx, aCallable, aIncumbentGlobal)
+  {
+  }
+
+  // See CallbackObject for an explanation of the arguments.
+  explicit CallbackFunction(JS::Handle<JSObject*> aCallable,
+                            JS::Handle<JSObject*> aAsyncStack,
+                            nsIGlobalObject* aIncumbentGlobal)
+    : CallbackObject(aCallable, aAsyncStack, aIncumbentGlobal)
+  {
+  }
+
+  JS::Handle<JSObject*> Callable() const
+  {
+    return Callback();
+  }
+
+  JS::Handle<JSObject*> CallablePreserveColor() const
+  {
+    return CallbackPreserveColor();
+  }
+
+  bool HasGrayCallable() const
+  {
+    // Play it safe in case this gets called after unlink.
+    return mCallback && JS::ObjectIsMarkedGray(mCallback);
+  }
+
+protected:
+  explicit CallbackFunction(CallbackFunction* aCallbackFunction)
+    : CallbackObject(aCallbackFunction)
+  {
+  }
+
+  // See CallbackObject for an explanation of the arguments.
+  CallbackFunction(JSContext* aCx, JS::Handle<JSObject*> aCallable,
+                   nsIGlobalObject* aIncumbentGlobal,
+                   const FastCallbackConstructor&)
+    : CallbackObject(aCx, aCallable, aIncumbentGlobal,
+                     FastCallbackConstructor())
+  {
+  }
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_CallbackFunction_h