Add "Open with <ARC-app-name>" items to the context menu

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index ad61d18ff6446e19a824f65b601e4e06173dbe05..b1ea510aff7bff26cd8b1892a78e68eaded50865 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -105,6 +105,7 @@ class HighContrastController;
 class KeyboardUI;
 class KeyboardUMAEventFilter;
 class LastWindowClosedLogoutReminder;
+class LinkHandlerModelFactory;
 class LocaleNotificationController;
 class LockStateController;
 class LogoutConfirmationController;
@@ -362,6 +363,13 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
   DesktopBackgroundController* desktop_background_controller() {
     return desktop_background_controller_.get();
   }
+  LinkHandlerModelFactory* link_handler_model_factory() {
+    return link_handler_model_factory_;
+  }
+  void set_link_handler_model_factory(
+      LinkHandlerModelFactory* link_handler_model_factory) {
+    link_handler_model_factory_ = link_handler_model_factory;
+  }
   PowerButtonController* power_button_controller() {
     return power_button_controller_.get();
   }
@@ -684,6 +692,7 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
   std::unique_ptr<::wm::WindowModalityController> window_modality_controller_;
   std::unique_ptr<views::corewm::TooltipController> tooltip_controller_;
   std::unique_ptr<DesktopBackgroundController> desktop_background_controller_;
+  LinkHandlerModelFactory* link_handler_model_factory_;
   std::unique_ptr<PowerButtonController> power_button_controller_;
   std::unique_ptr<LockStateController> lock_state_controller_;
   std::unique_ptr<MruWindowTracker> mru_window_tracker_;