1 files changed, 49 insertions, 0 deletions
diff --git a/dom/base/SameProcessMessageQueue.h b/dom/base/SameProcessMessageQueue.h
new file mode 100644
index 0000000000..b8b79fd323
--- /dev/null
+++ b/dom/base/SameProcessMessageQueue.h
@@ -0,0 +1,49 @@
+/* -*- 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_dom_SameProcessMessageQueue_h
+#define mozilla_dom_SameProcessMessageQueue_h
+
+#include "nsIRunnable.h"
+#include "mozilla/RefPtr.h"
+#include "nsTArray.h"
+
+namespace mozilla::dom {
+
+class SameProcessMessageQueue {
+ public:
+  SameProcessMessageQueue();
+  virtual ~SameProcessMessageQueue();
+
+  class Runnable : public nsIRunnable {
+   public:
+    explicit Runnable();
+
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIRUNNABLE
+
+    virtual nsresult HandleMessage() = 0;
+
+   protected:
+    virtual ~Runnable() = default;
+
+   private:
+    bool mDispatched;
+  };
+
+  void Push(Runnable* aRunnable);
+  void Flush();
+
+  static SameProcessMessageQueue* Get();
+
+ private:
+  nsTArray<RefPtr<Runnable>> mQueue;
+  static SameProcessMessageQueue* sSingleton;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_SameProcessMessageQueue_h