Implement ShouldDisplaySettingsButton() for arc notification

Bug: none
Change-Id: I5659106f3c8bd6608f4f6f410e3815fa1bed8c71
Reviewed-on: https://chromium-review.googlesource.com/567899Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485943}

ui/arc/notification/arc_notification_delegate.cc

@@ -51,4 +51,9 @@ bool ArcNotificationDelegate::SettingsClick() {
   return true;
 }
 
+bool ArcNotificationDelegate::ShouldDisplaySettingsButton() {
+  DCHECK(item_);
+  return item_->IsOpeningSettingsSupported();
+}
+
 }  // namespace arc

ui/arc/notification/arc_notification_delegate.h

@@ -33,6 +33,7 @@ class ArcNotificationDelegate : public message_center::NotificationDelegate {
   void Close(bool by_user) override;
   void Click() override;
   bool SettingsClick() override;
+  bool ShouldDisplaySettingsButton() override;
 
  private:
   // The destructor is private since this class is ref-counted.