Support reading multiple InterfaceProviderSpecs from manifests

services/service_manager/public/interfaces/interface_provider_spec.mojom

Index: services/service_manager/public/interfaces/interface_provider_spec.mojom
diff --git a/services/service_manager/public/interfaces/interface_provider_spec.mojom b/services/service_manager/public/interfaces/interface_provider_spec.mojom
index 1609dbfbff5dffb9f53bfa7411ef576efaf80f01..f17d55b3cfbb02665d8222bb84b1f6ade88b6fdd 100644
--- a/services/service_manager/public/interfaces/interface_provider_spec.mojom
+++ b/services/service_manager/public/interfaces/interface_provider_spec.mojom
@@ -37,3 +37,8 @@ struct InterfaceProviderSpec {
   // all services in addition to specific ones specified.
   map<string, CapabilitySet> requires;
 };
+
+// The name of the InterfaceProviderSpec in service manifests used by the
+// Service Manager to control capabilities & interfaces exposed between
+// services via Connector.
+const string kServiceManager_ConnectorSpec = "service_manager:connector";