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

components/arc/intent_helper/arc_intent_helper_bridge.h

Index: components/arc/intent_helper/arc_intent_helper_bridge.h
diff --git a/components/arc/intent_helper/arc_intent_helper_bridge.h b/components/arc/intent_helper/arc_intent_helper_bridge.h
index c52eb9a809c27627f34814a78ed72ebf171b0e17..936f9985c379ef778e33aabdb83d289ec40c773d 100644
--- a/components/arc/intent_helper/arc_intent_helper_bridge.h
+++ b/components/arc/intent_helper/arc_intent_helper_bridge.h
@@ -11,6 +11,7 @@
 #include "ash/link_handler_model_factory.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "components/arc/arc_service.h"
 #include "components/arc/common/intent_helper.mojom.h"
@@ -46,12 +47,29 @@ class ArcIntentHelperBridge
     FAILED_ARC_NOT_SUPPORTED,
   };
 
+  class Observer {
+   public:
+    // OnAppsUpdated is called when intent helper is updated.

[Yusuke Sato, 2016/11/21 17:21:05]

// Called when app's intent filter is updated.

?

[oka, 2016/11/24 15:14:17]

Done.

+    virtual void OnAppsUpdated() = 0;
+   protected:
+    virtual ~Observer() {}
+  };
+
   ArcIntentHelperBridge(
       ArcBridgeService* bridge_service,
       const scoped_refptr<ActivityIconLoader>& icon_loader,
       const scoped_refptr<LocalActivityResolver>& activity_resolver);
   ~ArcIntentHelperBridge() override;
 
+  // Get returns the only instance of ArcIntentHelperBridge, or nullptr if it
+  // has not been created.
+  // This method is a workaround for adding observer to this class from
+  // Files App. Please avoid to use this as much as possible.
+  static ArcIntentHelperBridge* Get();
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
   // InstanceHolder<mojom::IntentHelperInstance>::Observer
   void OnInstanceReady() override;
   void OnInstanceClosed() override;
@@ -97,6 +115,8 @@ class ArcIntentHelperBridge
 
   base::ThreadChecker thread_checker_;
 
+  base::ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(ArcIntentHelperBridge);
 };