Add mash shelf application id support.

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);
 
-  AddItem(ShelfItem item, associated ShelfItemDelegate delegate);
-  RemoveItem(string id);
+  PinItem(ShelfItem item, associated ShelfItemDelegate delegate);
+  UnpinItem(string app_id);
 };
 
 // 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 {
@@ skipping 17 matching lines @@
   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 id, used to correlate windows and shortcuts (eg. 'exe:chrome').
-  string id;
+  // An app id, used to correlate windows and shortcuts (eg. 'mojo:foo').
+  string app_id;
 
-  // A title, used for tooltips, etc. (eg. 'Chrome').
-  string title;
+  // 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;
 };