cros: CustomFrameViewAsh avatar icon from a window prop

chrome/browser/ui/ash/session_util.h

 // Copyright (c) 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_ASH_SESSION_UTIL_H_
 #define CHROME_BROWSER_UI_ASH_SESSION_UTIL_H_
 
 #include "base/callback.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace aura {
 class Window;
 }
 
 namespace content {
 class BrowserContext;
 }
 
+namespace user_manager {
+class User;
+}
+
 content::BrowserContext* GetActiveBrowserContext();
 
 using GetActiveBrowserContextCallback =
     base::Callback<content::BrowserContext*(void)>;
 
 // See documentation in ash::ShellDelegate for the method of the same name.
 // |context| is the content::BrowserContext deemed active for the current
 // scenario. This is passed in because it can differ in tests vs. production.
 // See for example MultiUserWindowManagerTestChromeOS.
 bool CanShowWindowForUser(
     aura::Window* window,
     const GetActiveBrowserContextCallback& get_context_callback);
 
 gfx::ImageSkia GetAvatarImageForContext(content::BrowserContext* context);
+gfx::ImageSkia GetAvatarImageForUser(const user_manager::User* user);
 
 #endif  // CHROME_BROWSER_UI_ASH_SESSION_UTIL_H_