Show message center on lock screen

ui/message_center/message_center_impl.cc

Index: ui/message_center/message_center_impl.cc
diff --git a/ui/message_center/message_center_impl.cc b/ui/message_center/message_center_impl.cc
index 06a04611514ce0837d61e6da1f97a324dceb367a..1cd3bf7f88ec02208176dc8606f5a4d373005689 100644
--- a/ui/message_center/message_center_impl.cc
+++ b/ui/message_center/message_center_impl.cc
@@ -441,13 +441,17 @@ void MessageCenterImpl::NotifierEnabledChanged(
 
 void MessageCenterImpl::SetVisibility(Visibility visibility) {
   std::set<std::string> updated_ids;
-  notification_list_->SetMessageCenterVisible(
-      (visibility == VISIBILITY_MESSAGE_CENTER), &updated_ids);
-  notification_cache_.RecountUnread();
+  bool visible = visibility == VISIBILITY_MESSAGE_CENTER;
 
-  for (const auto& id : updated_ids) {
-    FOR_EACH_OBSERVER(
-        MessageCenterObserver, observer_list_, OnNotificationUpdated(id));
+  notification_list_->SetMessageCenterVisible(visible);
+  if (visible && !locked_) {
+    notification_list_->SetNotificationsShown(blockers_, &updated_ids);
+    notification_cache_.RecountUnread();
+
+    for (const auto& id : updated_ids) {
+      FOR_EACH_OBSERVER(
+          MessageCenterObserver, observer_list_, OnNotificationUpdated(id));
+    }
   }
 
   if (notification_queue_ &&
@@ -481,6 +485,10 @@ bool MessageCenterImpl::IsQuietMode() const {
   return notification_list_->quiet_mode();
 }
 
+bool MessageCenterImpl::IsLockedState() const {
+  return locked_;
+}
+
 bool MessageCenterImpl::HasClickedListener(const std::string& id) {
   scoped_refptr<NotificationDelegate> delegate =
       notification_list_->GetNotificationDelegate(id);
@@ -854,6 +862,14 @@ void MessageCenterImpl::SetQuietMode(bool in_quiet_mode) {
   quiet_mode_timer_.reset();
 }
 
+void MessageCenterImpl::SetLockedState(bool locked) {
+  if (locked != locked_) {
+    locked_ = locked;
+    FOR_EACH_OBSERVER(MessageCenterObserver, observer_list_,
+                      OnLockedStateChanged(locked));
+  }
+}
+
 void MessageCenterImpl::EnterQuietModeWithExpire(
     const base::TimeDelta& expires_in) {
   if (quiet_mode_timer_) {