Add GROUP_FILE ModelSafeGroup

chrome/browser/sync/glue/browser_thread_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_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
+#define CHROME_BROWSER_SYNC_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
+#pragma once
+
+#include "base/callback.h"
+#include "base/basictypes.h"
+#include "chrome/browser/sync/engine/model_safe_worker.h"
+#include "content/browser/browser_thread.h"
+
+namespace base {
+class WaitableEvent;
+}
+
+namespace browser_sync {
+
+// A ModelSafeWorker for models that accept requests from the syncapi that need
+// to be fulfilled on a browser thread, for example autofill on the DB thread.
+// TODO(sync): Try to generalize other ModelWorkers (e.g. history, etc).
+class BrowserThreadModelWorker : public browser_sync::ModelSafeWorker {
+ public:
+  BrowserThreadModelWorker(BrowserThread::ID thread, ModelSafeGroup group);
+  virtual ~BrowserThreadModelWorker();
+
+  // ModelSafeWorker implementation. Called on the sync thread.
+  virtual void DoWorkAndWaitUntilDone(Callback0::Type* work);
+  virtual ModelSafeGroup GetModelSafeGroup();
+
+ private:
+  void CallDoWorkAndSignalTask(
+      Callback0::Type* work, base::WaitableEvent* done);
+
+  BrowserThread::ID thread_;
+  ModelSafeGroup group_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserThreadModelWorker);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_BROWSER_THREAD_MODEL_WORKER_H_