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

components/arc/kiosk/arc_kiosk_bridge.h

 // 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.
 
 #ifndef COMPONENTS_ARC_KIOSK_ARC_KIOSK_BRIDGE_H_
 #define COMPONENTS_ARC_KIOSK_ARC_KIOSK_BRIDGE_H_
 
 #include <map>
 
 #include "base/macros.h"
 #include "components/arc/arc_service.h"
 #include "components/arc/common/kiosk.mojom.h"
 #include "components/arc/instance_holder.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace arc {
 
 class ArcBridgeService;
 
 class ArcKioskBridge : public ArcService,
                        public InstanceHolder<mojom::KioskInstance>::Observer,
                        public mojom::KioskHost {
  public:
-  explicit ArcKioskBridge(ArcBridgeService* bridge_service);
+  // Received IPCs are passed to this delegate.
+  class Delegate {
+   public:
+    virtual ~Delegate() = default;
+    virtual void OnMaintenanceSessionCreated() = 0;
+    virtual void OnMaintenanceSessionFinished() = 0;
+  };
+
+  ArcKioskBridge(ArcBridgeService* bridge_service, Delegate* delegate);
   ~ArcKioskBridge() override;
 
   // InstanceHolder<mojom::KioskInstance>::Observer overrides.
   void OnInstanceReady() override;
 
   // mojom::KioskHost overrides.
   void OnMaintenanceSessionCreated(int32_t session_id) override;
   void OnMaintenanceSessionFinished(int32_t session_id, bool success) override;
 
  private:
   mojo::Binding<mojom::KioskHost> binding_;
+  Delegate* const delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcKioskBridge);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_KIOSK_ARC_KIOSK_BRIDGE_H_