Implement Non-Closable Notification

ui/message_center/message_center_impl.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/message_center/message_center_impl.h"
 
 #include <algorithm>
 #include <deque>
 #include <utility>
 
@@ skipping 625 matching lines @@
   NotificationList::Notifications notifications =
       notification_list_->GetNotificationsByNotifierId(notifier_id);
   for (const auto& notification : notifications)
     RemoveNotification(notification->id(), false);
   if (!notifications.empty()) {
     notification_cache_.Rebuild(
         notification_list_->GetVisibleNotifications(blockers_));
   }
 }
 
-void MessageCenterImpl::RemoveAllNotifications(bool by_user) {
-  // Using not |blockers_| but an empty list since it wants to remove literally
-  // all notifications.
-  RemoveNotifications(by_user, NotificationBlockers());
-}
+void MessageCenterImpl::RemoveAllNotifications(bool by_user, RemoveType type) {
+  bool remove_pinned = (type == RemoveType::NON_PINNED);
 
-void MessageCenterImpl::RemoveAllVisibleNotifications(bool by_user) {
-  RemoveNotifications(by_user, blockers_);
-}
+  const NotificationBlockers& blockers =
+      (type == RemoveType::ALL ? NotificationBlockers() /* empty blockers */
+                               : blockers_ /* use default blockers */);
 
-void MessageCenterImpl::RemoveNotifications(
-    bool by_user,
-    const NotificationBlockers& blockers) {
   const NotificationList::Notifications notifications =
       notification_list_->GetVisibleNotifications(blockers);
   std::set<std::string> ids;
   for (const auto& notification : notifications) {
+    if (!remove_pinned && notification->pinned())
+      continue;
+
     ids.insert(notification->id());
     scoped_refptr<NotificationDelegate> delegate = notification->delegate();
     if (delegate.get())
       delegate->Close(by_user);
     notification_list_->RemoveNotification(notification->id());
   }
 
   if (!ids.empty()) {
     notification_cache_.Rebuild(
         notification_list_->GetVisibleNotifications(blockers_));
@@ skipping 217 matching lines @@
 }
 
 void MessageCenterImpl::EnableChangeQueueForTest(bool enable) {
   if (enable)
     notification_queue_.reset(new internal::ChangeQueue());
   else
     notification_queue_.reset();
 }
 
 }  // namespace message_center