IME for Mus: Use the catalog service to decide IME driver's name.

services/ui/manifest.json

 {
   "name": "service:ui",
   "display_name": "UI Service",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         // A collection of interfaces needed by a generic client of mus.
         // Additional interfaces may be requested a-la-carte.
         "app": [
           "ui::mojom::Clipboard",
@@ skipping 26 matching lines @@
           "display::mojom::TestDisplayController",
           "ui::mojom::AccessibilityManager",
           "ui::mojom::WindowManagerWindowTreeFactory"
         ],
         "ui:window_tree_host_factory": [
           "ui::mojom::WindowTreeHostFactory"
         ]
       },
       "requires": {
         "*": [ "app" ],
+        "service:catalog": [ "catalog:catalog" ],
         "service:service_manager": [ "service_manager:all_users" ],
         "service:ui": [ "ozone" ]
       }
     }
   }
 }