1 files changed, 50 insertions, 0 deletions
diff --git a/dom/media/systemservices/MediaTaskUtils.h b/dom/media/systemservices/MediaTaskUtils.h
new file mode 100644
index 000000000..c9b64fd2a
--- /dev/null
+++ b/dom/media/systemservices/MediaTaskUtils.h
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et ft=cpp : */
+/* 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_MediaTaskUtils_h
+#define mozilla_MediaTaskUtils_h
+
+#include "nsThreadUtils.h"
+
+// The main reason this file is separate from MediaUtils.h
+#include "base/task.h"
+
+namespace mozilla {
+namespace media {
+
+/* media::NewTaskFrom() - Create a Task from a lambda.
+ *
+ * Similar to media::NewRunnableFrom() - Create an nsRunnable from a lambda.
+ */
+
+template<typename OnRunType>
+class LambdaTask : public Runnable
+{
+public:
+  explicit LambdaTask(OnRunType&& aOnRun) : mOnRun(Move(aOnRun)) {}
+private:
+  NS_IMETHOD
+  Run() override
+  {
+    mOnRun();
+    return NS_OK;
+  }
+  OnRunType mOnRun;
+};
+
+template<typename OnRunType>
+already_AddRefed<LambdaTask<OnRunType>>
+NewTaskFrom(OnRunType&& aOnRun)
+{
+  typedef LambdaTask<OnRunType> LambdaType;
+  RefPtr<LambdaType> lambda = new LambdaType(Forward<OnRunType>(aOnRun));
+  return lambda.forget();
+}
+
+} // namespace media
+} // namespace mozilla
+
+#endif // mozilla_MediaTaskUtils_h