Require an explicit ServiceName annotation for interfaces in C++.

mojo/services/ui/views/interfaces/view_provider.mojom

Index: mojo/services/ui/views/interfaces/view_provider.mojom
diff --git a/mojo/services/ui/views/interfaces/view_provider.mojom b/mojo/services/ui/views/interfaces/view_provider.mojom
index b09ec929696f689ca09f8bfb27961c2279136c98..a1062dec2a8f8d31f0d98dd66ee51c7579529b0c 100644
--- a/mojo/services/ui/views/interfaces/view_provider.mojom
+++ b/mojo/services/ui/views/interfaces/view_provider.mojom
@@ -12,6 +12,7 @@ import "mojo/services/ui/views/interfaces/views.mojom";
 //
 // Applications should implement and expose this service so that they can
 // expose views to be embedded into other applications.
+[ServiceName="mojo::ui::ViewProvider"]
 interface ViewProvider {
   // Creates and registers a view with the view manager and returns its
   // view token (as provided by |ViewManager.RegisterView()|).