Plumb through notification action types and placeholders on Android

ui/message_center/notification.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/notification.h"
 
 #include "base/logging.h"
 #include "ui/message_center/notification_delegate.h"
 #include "ui/message_center/notification_types.h"
 
 namespace message_center {
 
 namespace {
 
 unsigned g_next_serial_number_ = 0;
 
 }  // namespace
 
 NotificationItem::NotificationItem(const base::string16& title,
                                    const base::string16& message)
     : title(title),
       message(message) {
 }
 
 ButtonInfo::ButtonInfo(const base::string16& title)
     : title(title) {
 }
 
+ButtonInfo::ButtonInfo(const ButtonInfo& other) = default;
+
+ButtonInfo::~ButtonInfo() = default;
+
+ButtonInfo& ButtonInfo::operator=(const ButtonInfo& other) = default;
+
 RichNotificationData::RichNotificationData()
     : priority(DEFAULT_PRIORITY),
       never_timeout(false),
       timestamp(base::Time::Now()),
       context_message(base::string16()),
       progress(0),
       should_make_spoken_feedback_for_popup_updates(true),
       clickable(true),
 #if defined(OS_CHROMEOS)
       pinned(false),
@@ skipping 138 matching lines @@
       NOTIFICATION_TYPE_SIMPLE, notification_id, title, message, icon,
       base::string16() /* display_source */, GURL(),
       NotifierId(NotifierId::SYSTEM_COMPONENT, system_component_id),
       RichNotificationData(),
       new HandleNotificationClickedDelegate(click_callback)));
   notification->SetSystemPriority();
   return notification;
 }
 
 }  // namespace message_center