Service Manager: Implement graceful service termination

services/service_manager/public/interfaces/service.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 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 {
   // The service's identity.
   Identity identity;
 
   // The service's interface provider specs, from its manifest.
   map<string, InterfaceProviderSpec> interface_provider_specs;
 };
 
@@ skipping 14 matching lines @@
   //    * The user associated with this instance in the service manager. This
   //      will never be kInheritUserID.
   //    * The instance group this instance belongs to.
   //
   // Response parameters:
   //
   //  connector_request
   //    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
   // of interface implementations with the remote service. See also
   // documentation in service_manager.mojom for Connect(). The 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
   //    Contains the source identity and interface provider specs.
   //
   //  interfaces
   //    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) => ();
 };