[Extensions][TaskScheduler] Update ActivityLog for scheduling migration

chrome/browser/extensions/activity_log/activity_log_task_runner.h

+// Copyright 2017 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 CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_TASK_RUNNER_H_
+#define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_TASK_RUNNER_H_
+
+#include "base/memory/ref_counted.h"
+
+namespace base {
+class TaskRunner;
+}
+
+namespace extensions {
+
+const scoped_refptr<base::TaskRunner> GetActivityLogTaskRunner();

[gab, 2017/07/20 16:26:43]

Use base::SequencedTaskRunner in interface and impl since that's what it is
under the hood (or even SingleThreadTaskRunner if that's required, re. SQL disk
I/O error discussion)

[Devlin, 2017/07/27 13:41:19]

Done.

+
+// TODO(devlin): It would be great to remove this, but we can't create a valid
+// SQL database in unittests using the normal ActivityLogTaskRunner. Might be
+// related to https://crbug.com/739945.
+void SetActivityLogTaskRunnerForTesting(base::TaskRunner* task_runner);
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_ACTIVITY_LOG_TASK_RUNNER_H_