Refactored signin/sync error controllers for the avatar button

chrome/browser/sync/avatar_sync_error_controller.h

+// Copyright (c) 2016 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_AVATAR_SYNC_ERROR_CONTROLLER_H_
+#define CHROME_BROWSER_SYNC_AVATAR_SYNC_ERROR_CONTROLLER_H_
+
+#include "components/sync_driver/sync_error_controller.h"
+
+class Profile;
+
+// Keeps track of the sync errors that should be exposed to the user in the
+// avatar button.
+class AvatarSyncErrorController : public SyncErrorController::Observer {
+ public:
+  explicit AvatarSyncErrorController(Profile* profile);
+  ~AvatarSyncErrorController() override;
+
+  // SyncErrorController::Observer:
+  void OnErrorChanged() override;
+
+  bool has_error() { return has_error_; }
+
+ private:
+  SyncErrorController* GetSyncErrorControllerIfNeeded(Profile* profile);
+
+  Profile* profile_;
+  bool has_error_;
+
+  DISALLOW_COPY_AND_ASSIGN(AvatarSyncErrorController);
+};
+
+#endif  // CHROME_BROWSER_SYNC_AVATAR_SYNC_ERROR_CONTROLLER_H_