Create base::test::ScopedTaskScheduler.

base/test/scoped_task_scheduler.h

Index: base/test/scoped_task_scheduler.h
diff --git a/base/test/scoped_task_scheduler.h b/base/test/scoped_task_scheduler.h
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+++ b/base/test/scoped_task_scheduler.h
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+// 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 BASE_TEST_SCOPED_TASK_SCHEDULER_H_
+#define BASE_TEST_SCOPED_TASK_SCHEDULER_H_
+
+#include "base/macros.h"
+
+namespace base {
+
+class TaskScheduler;
+
+namespace test {
+
+// Initializes a TaskScheduler and allows usage of the
+// base/task_scheduler/post_task.h API within its scope.
+class ScopedTaskScheduler {
+ public:
+  // Initializes a TaskScheduler with default arguments.
+  ScopedTaskScheduler();
+
+  // Waits until all TaskScheduler tasks blocking shutdown complete their
+  // execution (see TaskShutdownBehavior). Then, joins all TaskScheduler threads
+  // and deletes the TaskScheduler.
+  //
+  // Note that joining TaskScheduler threads may involve waiting for
+  // CONTINUE_ON_SHUTDOWN tasks to complete their execution. Normally, in
+  // production, the process exits without joining TaskScheduler threads.
+  ~ScopedTaskScheduler();
+
+ private:
+  const TaskScheduler* task_scheduler_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedTaskScheduler);
+};
+
+}  // namespace test
+}  // namespace base
+
+#endif  // BASE_TEST_SCOPED_TASK_SCHEDULER_H_