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diff --git a/base/task_scheduler/scheduler_worker_params.h b/base/task_scheduler/scheduler_worker_params.h
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+++ b/base/task_scheduler/scheduler_worker_params.h
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+// 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 BASE_TASK_SCHEDULER_SCHEDULER_WORKER_PARAMS_H_
+#define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_PARAMS_H_
+
+namespace base {
+
+enum class SchedulerBackwardCompatibility {
+  // No backward compatibility.
+  DISABLED,
+
+  // On Windows, initialize COM STA to mimic SequencedWorkerPool and
+  // BrowserThreadImpl. Behaves like DISABLED on other platforms.
+  // TODO(fdoray): Get rid of this and force tasks that care about a
+  // CoInitialized environment to request one explicitly (via an upcoming
+  // execution mode).
+  INIT_COM_STA,
+};
+
+}  // namespace base
+
+#endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_PARAMS_H_