Start untangling the avatar switcher from BrowserNonClientFrameView

chrome/browser/ui/views/frame/avatar_button_manager.h

+// Copyright 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_UI_VIEWS_FRAME_AVATAR_BUTTON_MANAGER_H_
+#define CHROME_BROWSER_UI_VIEWS_FRAME_AVATAR_BUTTON_MANAGER_H_
+
+#include "chrome/browser/ui/views/profiles/avatar_button_style.h"
+#include "ui/views/controls/button/button.h"
+
+class BrowserNonClientFrameView;
+
+// Manages an avatar button displayed in a browser frame. The button displays
+// the name of the active or guest profile, and may be null.
+class AvatarButtonManager : public views::ButtonListener {
+ public:
+  explicit AvatarButtonManager(BrowserNonClientFrameView* frame_view);
+
+  // Adds or removes the avatar button from the frame, based on the BrowserView
+  // properties.
+  void Update(AvatarButtonStyle style);
+
+  // Gets the avatar button as a view::View.
+  views::View* view() const { return view_; }
+
+ private:
+  // views::ButtonListener:
+  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
+
+  BrowserNonClientFrameView* frame_view_;  // Weak. Owns |this|.
+
+  // Menu button that displays the name of the active or guest profile.
+  // May be null and will not be displayed for off the record profiles.
+  views::View* view_;  // Owned by views hierarchy.
+
+  DISALLOW_COPY_AND_ASSIGN(AvatarButtonManager);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_AVATAR_BUTTON_MANAGER_H_