Show a notification when an ephemeral app consumes excessive disk space

ui/message_center/notification_delegate.cc

Index: ui/message_center/notification_delegate.cc
diff --git a/ui/message_center/notification_delegate.cc b/ui/message_center/notification_delegate.cc
index 899cb2a1056845cfa95bdb88d520191a0c3d9f31..09ef959dbf0c173c25ac9096117b12c8fd61577c 100644
--- a/ui/message_center/notification_delegate.cc
+++ b/ui/message_center/notification_delegate.cc
@@ -6,10 +6,14 @@
 
 namespace message_center {
 
+// NotificationDelegate:
+
 bool NotificationDelegate::HasClickedListener() { return false; }
 
 void NotificationDelegate::ButtonClick(int button_index) {}
 
+// HandleNotificationClickedDelegate:
+
 HandleNotificationClickedDelegate::HandleNotificationClickedDelegate(
     const base::Closure& closure)
     : closure_(closure) {
@@ -39,4 +43,32 @@ void HandleNotificationClickedDelegate::Click() {
 void HandleNotificationClickedDelegate::ButtonClick(int button_index) {
 }
 
+// HandleNotificationButtonClickDelegate:
+
+HandleNotificationButtonClickDelegate::HandleNotificationButtonClickDelegate(
+    const ButtonClickCallback& button_callback)
+    : button_callback_(button_callback) {
+}
+
+HandleNotificationButtonClickDelegate::
+    ~HandleNotificationButtonClickDelegate() {
+}
+
+void HandleNotificationButtonClickDelegate::Display() {
+}
+
+void HandleNotificationButtonClickDelegate::Error() {
+}
+
+void HandleNotificationButtonClickDelegate::Close(bool by_user) {
+}
+
+void HandleNotificationButtonClickDelegate::Click() {
+}
+
+void HandleNotificationButtonClickDelegate::ButtonClick(int button_index) {
+  if (!button_callback_.is_null())
+    button_callback_.Run(button_index);
+}
+
 }  // namespace message_center