Show message to indicate that mirriring with more than 3 display is not supported.

ash/display/display_error_observer_chromeos.cc

Index: ash/display/display_error_observer_chromeos.cc
diff --git a/ash/display/display_error_observer_chromeos.cc b/ash/display/display_error_observer_chromeos.cc
index e9231c3cd6106478ad00fec0ca47c98a70b9a3f7..5f21c68f436fb73c01e8bac7af33ff9e892146e3 100644
--- a/ash/display/display_error_observer_chromeos.cc
+++ b/ash/display/display_error_observer_chromeos.cc
@@ -4,52 +4,11 @@
 
 #include "ash/display/display_error_observer_chromeos.h"
 
-#include <cinttypes>
-#include <memory>
-#include <utility>
-
-#include "ash/new_window_delegate.h"
-#include "ash/shell.h"
-#include "ash/system/system_notifier.h"
+#include "ash/display/display_util.h"
 #include "base/strings/string_number_conversions.h"
-#include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/message_center/message_center.h"
-#include "ui/message_center/notification.h"
-#include "ui/message_center/notification_delegate.h"
-#include "ui/message_center/notification_list.h"
-
-using message_center::Notification;
 
 namespace ash {
-namespace {
-
-const char kDisplayErrorNotificationId[] = "chrome://settings/display/error";
-
-// A notification delegate that will start the feedback app when the notication
-// is clicked.
-class DisplayErrorNotificationDelegate
-    : public message_center::NotificationDelegate {
- public:
-  DisplayErrorNotificationDelegate() = default;
-
-  // message_center::NotificationDelegate:
-  bool HasClickedListener() override { return true; }
-
-  void Click() override {
-    ash::Shell::GetInstance()->new_window_delegate()->OpenFeedbackPage();
-  }
-
- private:
-  // Private destructor since NotificationDelegate is ref-counted.
-  ~DisplayErrorNotificationDelegate() override = default;
-
-  DISALLOW_COPY_AND_ASSIGN(DisplayErrorNotificationDelegate);
-};
-
-}  // namespace
 
 DisplayErrorObserver::DisplayErrorObserver() {
 }
@@ -68,42 +27,10 @@ void DisplayErrorObserver::OnDisplayModeChangeFailed(
                << ".";
   }
 
-  // Always remove the notification to make sure the notification appears
-  // as a popup in any situation.
-  message_center::MessageCenter::Get()->RemoveNotification(
-      kDisplayErrorNotificationId, false /* by_user */);
-
-  int message_id = (new_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR) ?
-      IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING :
-      IDS_ASH_DISPLAY_FAILURE_ON_NON_MIRRORING;
-
-  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
-  std::unique_ptr<Notification> notification(new Notification(
-      message_center::NOTIFICATION_TYPE_SIMPLE, kDisplayErrorNotificationId,
-      base::string16(),  // title
-      l10n_util::GetStringUTF16(message_id),
-      bundle.GetImageNamed(IDR_AURA_NOTIFICATION_DISPLAY),
-      base::string16(),  // display_source
-      GURL(),
-      message_center::NotifierId(message_center::NotifierId::SYSTEM_COMPONENT,
-                                 system_notifier::kNotifierDisplayError),
-      message_center::RichNotificationData(),
-      new DisplayErrorNotificationDelegate));
-  message_center::MessageCenter::Get()->AddNotification(
-      std::move(notification));
-}
-
-base::string16
-DisplayErrorObserver::GetDisplayErrorNotificationMessageForTest() {
-  message_center::NotificationList::Notifications notifications =
-      message_center::MessageCenter::Get()->GetVisibleNotifications();
-  for (message_center::NotificationList::Notifications::const_iterator iter =
-           notifications.begin(); iter != notifications.end(); ++iter) {
-    if ((*iter)->id() == kDisplayErrorNotificationId)
-      return (*iter)->message();
-  }
-
-  return base::string16();
+  ShowDisplayErrorNotification(
+      (new_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR)
+          ? IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING
+          : IDS_ASH_DISPLAY_FAILURE_ON_NON_MIRRORING);
 }
 
 }  // namespace ash