Refactored signin/sync error controllers for the avatar button

chrome/browser/signin/avatar_signin_error_controller.h

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.

[sky, 2016/07/27 21:42:54]

nit: no '(c)', see style guide.

[Jane, 2016/07/29 13:53:46]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SIGNIN_AVATAR_SIGNIN_ERROR_CONTROLLER_H_
+#define CHROME_BROWSER_SIGNIN_AVATAR_SIGNIN_ERROR_CONTROLLER_H_
+
+#include "components/signin/core/browser/signin_error_controller.h"
+
+class Profile;
+
+// Keeps track of auth errors, which should be exposed to the user in the avatar
+// button.
+class AvatarSigninErrorController : public SigninErrorController::Observer {
+ public:
+  explicit AvatarSigninErrorController(Profile* profile);
+  ~AvatarSigninErrorController() override;
+
+  // SigninErrorController::Observer:
+  void OnErrorChanged() override;
+
+  bool has_error() { return has_error_; }
+
+ private:
+  Profile* profile_;
+  bool has_error_;
+
+  DISALLOW_COPY_AND_ASSIGN(AvatarSigninErrorController);
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_AVATAR_SIGNIN_ERROR_CONTROLLER_H_