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

chrome/browser/chromeos/extensions/file_manager/event_router.h

Index: chrome/browser/chromeos/extensions/file_manager/event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_manager/event_router.h b/chrome/browser/chromeos/extensions/file_manager/event_router.h
index f0d5252c0032aeec7aeb3b6e0362e6541175c06f..ded9db4fa493a1100339b2233acb80541ecfa468 100644
--- a/chrome/browser/chromeos/extensions/file_manager/event_router.h
+++ b/chrome/browser/chromeos/extensions/file_manager/event_router.h
@@ -26,6 +26,7 @@
 #include "chromeos/disks/disk_mount_manager.h"
 #include "chromeos/network/network_state_handler_observer.h"
 #include "chromeos/settings/timezone_settings.h"
+#include "components/arc/arc_service_manager.h"
 #include "components/drive/chromeos/file_system_observer.h"
 #include "components/drive/chromeos/sync_client.h"
 #include "components/drive/service/drive_service_interface.h"
@@ -54,7 +55,8 @@ class EventRouter : public KeyedService,
                     public chromeos::system::TimezoneSettings::Observer,
                     public drive::FileSystemObserver,
                     public drive::DriveServiceObserver,
-                    public VolumeManagerObserver {
+                    public VolumeManagerObserver,
+                    public arc::ArcServiceManager::Observer {
  public:
   typedef base::Callback<void(const base::FilePath& virtual_path,
                               const drive::FileChange* list,
@@ -65,6 +67,9 @@ class EventRouter : public KeyedService,
   explicit EventRouter(Profile* profile);
   ~EventRouter() override;
 
+  // arc::ArcServiceManager::Observer overrides.
+  void OnAppsUpdated() override;
+
   // KeyedService overrides.
   void Shutdown() override;