Service Manager: Implement graceful service termination

services/service_manager/public/interfaces/service.mojom

Index: services/service_manager/public/interfaces/service.mojom
diff --git a/services/service_manager/public/interfaces/service.mojom b/services/service_manager/public/interfaces/service.mojom
index aeb66172a4a2d5c1b12fa8bfecdea6f92d25e8e6..e5f8d681928bc6b713d660a1647405f0872eca47 100644
--- a/services/service_manager/public/interfaces/service.mojom
+++ b/services/service_manager/public/interfaces/service.mojom
@@ -7,6 +7,7 @@ module service_manager.mojom;
 import "services/service_manager/public/interfaces/connector.mojom";
 import "services/service_manager/public/interfaces/interface_provider.mojom";
 import "services/service_manager/public/interfaces/interface_provider_spec.mojom";
+import "services/service_manager/public/interfaces/service_control.mojom";
 
 // Metadata describing an instance of a service.
 struct ServiceInfo {
@@ -41,7 +42,11 @@ interface Service {
   //    An optional Connector request for the service manager to bind, allowing
   //    the initialized client to connect to others.
   //
-  OnStart(ServiceInfo info) => (Connector&? connector_request);
+  //  control_request
+  //    An optional associated ServiceControl request.
+  //
+  OnStart(ServiceInfo info) => (Connector&? connector_request,
+                                associated ServiceControl&? control_request);
 
   // Called when another service attempts to open a connection to this
   // service. A service implements this method to complete the exchange
@@ -50,6 +55,8 @@ interface Service {
   // originating the request is referred to as the "source" and the one
   // receiving the "target".
   //
+  // The Service must respond to acknowledge receipt of the request.
+  //
   // Parameters:
   //
   //  source_info
@@ -59,6 +66,5 @@ interface Service {
   //    A request for an InterfaceProvider by which the source service may
   //    seek to bind interface implementations exported by the target.
   //
-  OnConnect(ServiceInfo source_info,
-            InterfaceProvider&? interfaces);
+  OnConnect(ServiceInfo source_info, InterfaceProvider&? interfaces) => ();
 };