mash: Disable ash_sysui; begin removal.

ash/public/interfaces/user_window_controller.mojom

-// 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.
-
-module ash.mojom;
-
-struct UserWindow {
-  uint32 window_id;  // The local window id, defined by UserWindowController.
-  string window_title;  // The window title.
-  bool window_has_focus;  // A flag; true if the window is currently focused.
-  array<uint8> window_app_icon;  // A serialized SkBitmap.
-  string window_app_id;  // The window application ID (ie. 'mojo:foo').
-  bool ignored_by_shelf; // A flag; true to avoid showing a shelf item.
-};
-
-// An observer of user windows within mojom::Container::USER_WINDOWS.
-// TODO(msw): Observe focus changes, title/icon changes, etc.
-interface UserWindowObserver {
-  // Called when the observer is first added to supply the initial state.
-  OnUserWindowObserverAdded(array<UserWindow> user_windows);
-
-  OnUserWindowAdded(UserWindow user_window);
-  OnUserWindowRemoved(uint32 window_id);
-
-  OnUserWindowTitleChanged(uint32 window_id, string window_title);
-
-  // |app_icon| is a serialized SkBitmap.
-  OnUserWindowAppIconChanged(uint32 window_id, array<uint8> app_icon);
-
-  OnUserWindowFocusChanged(uint32 window_id, bool has_focus);
-};
-
-// An interface allowing system UIs to manage the set of user windows.
-// TODO(msw): Add minimization, restoration, opening a chooser view, etc.
-interface UserWindowController {
-  AddUserWindowObserver(UserWindowObserver observer);
-  ActivateUserWindow(uint32 window_id);
-};