diff -r 000000000000 -r 6474c204b198 content/media/mediasource/AsyncEventRunner.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/mediasource/AsyncEventRunner.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* -*- 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 MOZILLA_ASYNCEVENTRUNNER_H_
+#define MOZILLA_ASYNCEVENTRUNNER_H_
+
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+template <typename T>
+class AsyncEventRunner : public nsRunnable
+{
+public:
+  AsyncEventRunner(T* aTarget, const char* aName)
+    : mTarget(aTarget)
+    , mName(aName)
+  {}
+
+  NS_IMETHOD Run() MOZ_OVERRIDE
+  {
+    mTarget->DispatchSimpleEvent(mName);
+    return NS_OK;
+  }
+
+private:
+  nsRefPtr<T> mTarget;
+  const char* mName;
+};
+
+} // namespace mozilla
+#endif /* MOZILLA_ASYNCEVENTRUNNER_H_ */