Add shortcut to show avatar menu

chrome/browser/ui/gtk/avatar_menu_button_gtk.h

 // Copyright (c) 2011 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_GTK_AVATAR_MENU_BUTTON_GTK_H_
 #define CHROME_BROWSER_UI_GTK_AVATAR_MENU_BUTTON_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 16 matching lines @@
   GtkWidget* widget() const { return widget_.get(); }
 
   // Sets the location the arrow should be displayed on the menu bubble.
   void set_menu_arrow_location(BubbleGtk::ArrowLocationGtk arrow_location) {
     arrow_location_ = arrow_location;
   }
 
   // Sets the image to display on the button, typically the profile icon.
   void SetIcon(const SkBitmap &icon);
 
+  // Show the avatar bubble.
+  void ShowAvatarBubble();
+
  private:
   CHROMEGTK_CALLBACK_1(AvatarMenuButtonGtk, gboolean, OnButtonPressed,
                        GdkEventButton*);
 
   // The button widget.
   ui::OwnedWidgetGtk widget_;
 
   // A weak pointer to the image widget displayed on the button.
   GtkWidget* image_;
 
   // A weak pointer to a browser. Used to create the bubble menu.
   Browser* browser_;
 
   // Which side of the bubble to display the arrow.
   BubbleGtk::ArrowLocationGtk arrow_location_;
 
   DISALLOW_COPY_AND_ASSIGN(AvatarMenuButtonGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_AVATAR_MENU_BUTTON_GTK_H_