diff -r 000000000000 -r 6474c204b198 dom/base/nsIScriptTimeoutHandler.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/base/nsIScriptTimeoutHandler.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et 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 nsIScriptTimeoutHandler_h___
+#define nsIScriptTimeoutHandler_h___
+
+#include "nsTArray.h"
+#include "js/TypeDecls.h"
+
+namespace mozilla {
+namespace dom {
+class Function;
+} // namespace dom
+} // namespace mozilla
+
+#define NS_ISCRIPTTIMEOUTHANDLER_IID \
+{ 0x53c8e80e, 0xcc78, 0x48bc, \
+ { 0xba, 0x63, 0x0c, 0xb9, 0xdb, 0xf7, 0x06, 0x34 } }
+
+/**
+ * Abstraction of the script objects etc required to do timeouts in a
+ * language agnostic way.
+ */
+
+class nsIScriptTimeoutHandler : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTTIMEOUTHANDLER_IID)
+
+  // Get the Function to call.  If this returns nullptr, GetHandlerText() will
+  // be called to get the string.
+  virtual mozilla::dom::Function *GetCallback() = 0;
+
+  // Get the handler text of not a compiled object.
+  virtual const char16_t *GetHandlerText() = 0;
+
+  // Get the location of the script.
+  // Note: The memory pointed to by aFileName is owned by the
+  // nsIScriptTimeoutHandler and should not be freed by the caller.
+  virtual void GetLocation(const char **aFileName, uint32_t *aLineNo) = 0;
+
+  // If we have a Function, get the arguments for passing to it.
+  virtual const nsTArray<JS::Value>& GetArgs() = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptTimeoutHandler,
+                              NS_ISCRIPTTIMEOUTHANDLER_IID)
+
+#endif // nsIScriptTimeoutHandler_h___