mash: Port ash_sysui ShelfDelegateMus impl to mojo:ash.

mash/shelf/public/interfaces/shelf.mojom

-// 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.
-
-module mash.shelf.mojom;
-
-import "mash/shelf/public/interfaces/shelf_constants.mojom";
-import "skia/public/interfaces/bitmap.mojom";
-
-// TODO(msw): Add support for multiple displays (with unified and multi-shelf).
-
-// The Shelf controller allows clients (eg. Chrome) to control the mash shelf.
-interface ShelfController {
-  AddObserver(associated ShelfObserver observer);
-
-  SetAlignment(Alignment alignment);
-  SetAutoHideBehavior(AutoHideBehavior auto_hide);
-
-  PinItem(ShelfItem item, associated ShelfItemDelegate delegate);
-  UnpinItem(string app_id);
-
-  SetItemImage(string app_id, skia.mojom.Bitmap image);
-};
-
-// ShelfObserver is notified on shelf changes; used to persist profile settings.
-interface ShelfObserver {
-  OnAlignmentChanged(Alignment alignment);
-  OnAutoHideBehaviorChanged(AutoHideBehavior auto_hide);
-};
-
-// ShelfItemDelegate handles command execution and observes shelf item changes.
-interface ShelfItemDelegate {
-  // Called when a pinned shelf item is invoked without an open window.
-  LaunchItem();
-
-  // Called on invocation of a shelf item's context menu command.
-  ExecuteCommand(uint32 command_id, int32 event_flags);
-
-  // Called when a shelf item is pinned or unpinned.
-  ItemPinned();
-  ItemUnpinned();
-
-  // Called when a pinned shelf item is reordered.
-  // |order| is the index of the item on the shelf.
-  ItemReordered(uint32 order);
-};
-
-// ContextMenuItems may be used to supplement ash shelf item context menus.
-struct ContextMenuItem {
-  enum Type { ITEM, CHECK, RADIO, SEPARATOR, SUBMENU };
-
-  Type type;
-  uint32 command_id;
-  string? label;
-  array<ContextMenuItem>? submenu;
-  bool enabled;
-  bool checked;
-  uint32 radio_group_id;
-};
-
-// ShelfItem contains the basic fields needed to pin shortcut items.
-struct ShelfItem {
-  // An app id, used to correlate windows and shortcuts (eg. 'mojo:foo').
-  string app_id;
-
-  // A app title, used for tooltips, etc. (eg. 'Foo Application').
-  string app_title;
-
-  // An icon image Bitmap, shown on the shelf.
-  skia.mojom.Bitmap image;
-
-  // Additional context menu items (eg. 'New Incognito Window').
-  array<ContextMenuItem>? context_menu_items;
-};