arc: Stop/start ARC++ kiosk app when maintenance session started/finished.

components/arc/kiosk/arc_kiosk_bridge.cc

 // Copyright 2016 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.
 
 #include "components/arc/kiosk/arc_kiosk_bridge.h"
 
 #include "components/arc/arc_bridge_service.h"
-#include "components/arc/arc_service_manager.h"
 
 namespace arc {
 
-ArcKioskBridge::ArcKioskBridge(ArcBridgeService* bridge_service)
-    : ArcService(bridge_service), binding_(this) {
+ArcKioskBridge::ArcKioskBridge(ArcBridgeService* bridge_service,
+                               Delegate* delegate)
+    : ArcService(bridge_service), binding_(this), delegate_(delegate) {
   arc_bridge_service()->kiosk()->AddObserver(this);
 }
 
 ArcKioskBridge::~ArcKioskBridge() {
   arc_bridge_service()->kiosk()->RemoveObserver(this);
 }
 
 void ArcKioskBridge::OnInstanceReady() {
   mojom::KioskInstance* kiosk_instance =
       arc_bridge_service()->kiosk()->GetInstanceForMethod("Init");
   DCHECK(kiosk_instance);
   kiosk_instance->Init(binding_.CreateInterfacePtrAndBind());
 }
 
 void ArcKioskBridge::OnMaintenanceSessionCreated(int32_t session_id) {
+  if (delegate_) {

[Luis Héctor Chávez, 2016/12/01 20:13:33]

under which circumstances would |delegate_| be nullptr? If there aren't any (I
think there shouldn't), please add a DCHECK(delegate_); in L14.

[Sergey Poromov, 2016/12/16 16:12:05]

Done.

+    delegate_->OnMaintenanceSessionCreated();
+  }
   // TODO(poromov@) Show appropriate splash screen.
 }
 
 void ArcKioskBridge::OnMaintenanceSessionFinished(int32_t session_id,
                                                   bool success) {
-  // TODO(poromov@) Start kiosk app.
+  if (delegate_) {
+    delegate_->OnMaintenanceSessionFinished();
+  }
 }
 
 }  // namespace arc