Notify Files App when ARC++ app is installed/removed

components/arc/arc_service_manager.h

 // Copyright 2015 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_ARC_SERVICE_MANAGER_H_
 #define COMPONENTS_ARC_ARC_SERVICE_MANAGER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
 #include "base/task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "components/arc/intent_helper/activity_icon_loader.h"
+#include "components/arc/intent_helper/arc_intent_helper_observer.h"
 #include "components/arc/intent_helper/local_activity_resolver.h"
 
 namespace arc {
 
 class ArcBridgeService;
 class ArcService;
 
 // Manages creation and destruction of services that communicate with the ARC
 // instance via the ArcBridgeService.
-class ArcServiceManager {
+class ArcServiceManager : public arc::ArcIntentHelperObserver {
  public:
+  class Observer {
+   public:
+    // Called when app's intent filter is updated.
+    virtual void OnAppsUpdated() = 0;
+
+   protected:
+    virtual ~Observer() = default;
+  };
+
   explicit ArcServiceManager(
       scoped_refptr<base::TaskRunner> blocking_task_runner);
-  virtual ~ArcServiceManager();
+  ~ArcServiceManager() override;
 
   // |arc_bridge_service| can only be accessed on the thread that this
   // class was created on.
   ArcBridgeService* arc_bridge_service();
 
   // Adds a service to the managed services list.
   void AddService(std::unique_ptr<ArcService> service);
 
   // Gets the global instance of the ARC Service Manager. This can only be
   // called on the thread that this class was created on.
   static ArcServiceManager* Get();
 
+  // Returns if the ARC Service Manager instance exists.
+  static bool IsInitialized();
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // arc::ArcIntentHelperObserver overrides.
+  void OnAppsUpdated() override;
+
   // Called to shut down all ARC services.
   void Shutdown();
 
   scoped_refptr<base::TaskRunner> blocking_task_runner() const {
     return blocking_task_runner_;
   }
 
   // Set ArcBridgeService instance for testing. Call before ArcServiceManager
   // creation. ArcServiceManager owns |arc_bridge_service|.
   static void SetArcBridgeServiceForTesting(
       std::unique_ptr<ArcBridgeService> arc_bridge_service);
 
   // Returns the icon loader owned by ArcServiceManager and shared by services.
   scoped_refptr<ActivityIconLoader> icon_loader() { return icon_loader_; }
 
   // Returns the activity resolver owned by ArcServiceManager.
   scoped_refptr<LocalActivityResolver> activity_resolver() {
     return activity_resolver_;
   }
 
  private:
   base::ThreadChecker thread_checker_;
   scoped_refptr<base::TaskRunner> blocking_task_runner_;
 
   std::unique_ptr<ArcBridgeService> arc_bridge_service_;
   std::vector<std::unique_ptr<ArcService>> services_;
   scoped_refptr<ActivityIconLoader> icon_loader_;
   scoped_refptr<LocalActivityResolver> activity_resolver_;
 
+  base::ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(ArcServiceManager);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_SERVICE_MANAGER_H_