Implement PasswordStoreProxyMac and SimplePasswordStoreMac.

chrome/browser/password_manager/simple_password_store_mac.h

+// Copyright 2015 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_PASSWORD_MANAGER_SIMPLE_PASSWORD_STORE_MAC_H_
+#define CHROME_BROWSER_PASSWORD_MANAGER_SIMPLE_PASSWORD_STORE_MAC_H_
+
+#include "components/password_manager/core/browser/password_store_default.h"
+
+// The same as PasswordStoreDefault but running on the dedicated thread. The
+// owner is responsible for the thread lifetime.
+class SimplePasswordStoreMac : public password_manager::PasswordStoreDefault {
+ public:
+  SimplePasswordStoreMac(
+      scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> background_thread_runner,
+      scoped_ptr<password_manager::LoginDatabase> login_db);
+
+  // Just hides the parent method. All the initialization is to be done by
+  // PasswordStoreProxyMac that is an owner of the class.
+  bool Init(const syncer::SyncableService::StartSyncFlare& flare) override;
+
+  // Clean |background_thread_runner_|.
+  void Shutdown() override;
+
+  using PasswordStoreDefault::GetBackgroundTaskRunner;
+
+ protected:
+  ~SimplePasswordStoreMac() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SimplePasswordStoreMac);
+};
+
+#endif  // CHROME_BROWSER_PASSWORD_MANAGER_SIMPLE_PASSWORD_STORE_MAC_H_