cros: CustomFrameViewAsh avatar icon from a window prop

ash/session/session_state_delegate.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 ASH_SESSION_SESSION_STATE_DELEGATE_H_
-#define ASH_SESSION_SESSION_STATE_DELEGATE_H_
-
-#include "ash/ash_export.h"
-
-namespace gfx {
-class ImageSkia;
-}
-
-namespace ash {
-
-class WmWindow;
-
-// Delegate for checking and modifying the session state.
-// DEPRECATED in favor of SessionController/SessionControllerClient for mash.
-// TODO(xiyuan): Remove this when SessionController etc are ready.
-class ASH_EXPORT SessionStateDelegate {
- public:
-  virtual ~SessionStateDelegate() {}
-
-  // Whether or not the window's title should show the avatar.
-  virtual bool ShouldShowAvatar(WmWindow* window) const = 0;
-
-  // Returns the avatar image for the specified window.
-  virtual gfx::ImageSkia GetAvatarImageForWindow(WmWindow* window) const = 0;
-};
-
-}  // namespace ash
-
-#endif  // ASH_SESSION_SESSION_STATE_DELEGATE_H_