mash: Add autoclick app.

chrome/app/mojo/chrome_manifest.json

 {
   "manifest_version": 1,
   "name": "exe:chrome",
   "display_name": "Chrome",
   "capabilities": {
     "required": {
-      "*": { "classes": [ "app" ] },
+      "*": { "classes": [ "app", "mash:launchable" ] },
       "mojo:ash": {
         "interfaces": [
           "ash::mojom::ShelfController",
           "ash::mojom::WallpaperController"
         ]
       },
-      "mojo:touch_hud": {
-        "interfaces": [
-          "mash::mojom::Launchable"
-        ]
+      "mojo:accessibility_autoclick": {
+         "interfaces": [ "ash::autoclick::mojom::AutoclickController" ]
       }
     },
     "provided": {
       "mash:launchable": [ "mash::mojom::Launchable" ],
       "app_list:presenter": [ "app_list::mojom::AppListPresenter" ]
     }
   }
 }