Refactor the avatar button/icon class

chrome/browser/ui/views/profiles/avatar_base_button.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_UI_VIEWS_PROFILES_AVATAR_BASE_BUTTON_H_
+#define CHROME_BROWSER_UI_VIEWS_PROFILES_AVATAR_BASE_BUTTON_H_
+
+#include "chrome/browser/profiles/profile_info_cache_observer.h"
+
+class Browser;
+
+// This view manages the button that sits in the top of the window frame and
+// displays the active profile's info when using multi-profiles.
+class AvatarBaseButton : public ProfileInfoCacheObserver {
+ public:
+  explicit AvatarBaseButton(Browser* browser);
+  ~AvatarBaseButton() override;
+
+ protected:
+  Browser* browser() const { return browser_; }
+
+  // Called when the profile info cache has changed, which means we might
+  // have to update the icon/text of the button.
+  virtual void Update() = 0;
+
+ private:
+  // ProfileInfoCacheObserver:
+  void OnProfileAdded(const base::FilePath& profile_path) override;
+  void OnProfileWasRemoved(const base::FilePath& profile_path,
+                           const base::string16& profile_name) override;
+  void OnProfileNameChanged(const base::FilePath& profile_path,
+                            const base::string16& old_profile_name) override;
+  void OnProfileAvatarChanged(const base::FilePath& profile_path) override;
+  void OnProfileSupervisedUserIdChanged(
+      const base::FilePath& profile_path) override;
+
+  Browser* browser_;
+
+  DISALLOW_COPY_AND_ASSIGN(AvatarBaseButton);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_PROFILES_AVATAR_BASE_BUTTON_H_