Show a notification when an ephemeral app consumes excessive disk space

ui/message_center/notification_delegate.cc

 // Copyright 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/notification_delegate.h"
 
 namespace message_center {
 
+// NotificationDelegate:
+
 bool NotificationDelegate::HasClickedListener() { return false; }
 
 void NotificationDelegate::ButtonClick(int button_index) {}
 
+// HandleNotificationClickedDelegate:
+
 HandleNotificationClickedDelegate::HandleNotificationClickedDelegate(
     const base::Closure& closure)
     : closure_(closure) {
 }
 
 HandleNotificationClickedDelegate::~HandleNotificationClickedDelegate() {
 }
 
 void HandleNotificationClickedDelegate::Display() {
 }
 
 void HandleNotificationClickedDelegate::Error() {
 }
 
 void HandleNotificationClickedDelegate::Close(bool by_user) {
 }
 
 bool HandleNotificationClickedDelegate::HasClickedListener() {
   return !closure_.is_null();
 }
 
 void HandleNotificationClickedDelegate::Click() {
   if (!closure_.is_null())
     closure_.Run();
 }
 
 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