[Sync] Make ModelSafeWorker a true interface

chrome/browser/sync/test/engine/fake_model_worker.h

+// Copyright (c) 2011 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_SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_
+#define CHROME_BROWSER_SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_
+#pragma once
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/threading/non_thread_safe.h"
+#include "chrome/browser/sync/engine/model_safe_worker.h"
+
+namespace browser_sync {
+
+// Fake implementation of ModelSafeWorker that does work on the
+// current thread regardless of the group.
+class FakeModelWorker : public ModelSafeWorker {
+ public:
+  explicit FakeModelWorker(ModelSafeGroup group);
+
+  // ModelSafeWorker implementation.
+  virtual UnrecoverableErrorInfo DoWorkAndWaitUntilDone(
+      const WorkCallback& work) OVERRIDE;
+  virtual ModelSafeGroup GetModelSafeGroup() OVERRIDE;
+
+ private:
+  virtual ~FakeModelWorker();
+
+  base::NonThreadSafe non_thread_safe_;
+
+  const ModelSafeGroup group_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeModelWorker);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_TEST_ENGINE_FAKE_MODEL_WORKER_H_
+