NOT INTENDED FOR LANDING: A promises demo

components/scheduler/promises/single_thread_promise_executor.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_SCHEDULER_PROMISES_SINGLE_THREAD_PROMISE_EXECUTOR_H_
+#define COMPONENTS_SCHEDULER_PROMISES_SINGLE_THREAD_PROMISE_EXECUTOR_H_
+
+#include "base/macros.h"
+#include "base/single_thread_task_runner.h"
+#include "components/scheduler/promises/promise_executor.h"
+
+namespace promise {
+namespace internal {
+
+class SCHEDULER_EXPORT SingleThreadPromiseExecutor : public PromiseExecutor {
+ public:
+  explicit SingleThreadPromiseExecutor(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
+  ~SingleThreadPromiseExecutor() override;
+
+  // PromiseExecutor implementation:
+  void StartResolveInternal(PromiseBase* promise) override;
+  bool OnPromiseResolved(PromiseBase* promise) override;
+  bool OnPromiseRejected(PromiseBase* promise) override;
+
+ private:
+  void ResolveImpl();
+  void DispatchResolveImpl();
+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(SingleThreadPromiseExecutor);
+};
+
+}  // namespace internal
+}  // namespace promise
+
+#endif  // COMPONENTS_SCHEDULER_PROMISES_SINGLE_THREAD_PROMISE_EXECUTOR_H_