Plumb Blink notification actions to button UI on desktop

components/html_viewer/web_notification_manager_impl.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_HTML_VIEWER_WEB_NOTIFICATION_MANAGER_IMPL_H_
 #define COMPONENTS_HTML_VIEWER_WEB_NOTIFICATION_MANAGER_IMPL_H_
 
 #include "third_party/WebKit/public/platform/modules/notifications/WebNotificationManager.h"
 
 namespace blink {
@@ skipping 22 matching lines @@
                                 blink::WebNotificationGetCallbacks*);
   virtual void close(blink::WebNotificationDelegate*);
   virtual void closePersistent(const blink::WebSecurityOrigin&,
                                int64_t persistentNotificationId);
   virtual void closePersistent(
       const blink::WebSecurityOrigin&,
       const blink::WebString& persistentNotificationId);
   virtual void notifyDelegateDestroyed(blink::WebNotificationDelegate*);
   virtual blink::WebNotificationPermission checkPermission(
       const blink::WebSecurityOrigin&);
+  virtual size_t maxActions();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebNotificationManagerImpl);
 };
 
 }  // namespace html_viewer
 
 #endif  // COMPONENTS_HTML_VIEWER_WEB_NOTIFICATION_MANAGER_IMPL_H_