Notification actions may have an icon url.

content/public/common/platform_notification_data.h

 // Copyright 2014 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 CONTENT_PUBLIC_COMMON_PLATFORM_NOTIFICATION_DATA_H_
 #define CONTENT_PUBLIC_COMMON_PLATFORM_NOTIFICATION_DATA_H_
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // A notification action (button); corresponds to Blink WebNotificationAction.
 struct CONTENT_EXPORT PlatformNotificationAction {
   PlatformNotificationAction();
   ~PlatformNotificationAction();
 
   // Action name that the author can use to distinguish them.
   std::string action;
 
   // Title of the button.
   base::string16 title;
+
+  // URL of the icon for the button. May be empty if no url was specified.
+  GURL icon;

[Peter Beverloo, 2016/01/27 13:24:45]

Please make sure that this struct and the IPC_STRUCT_TRAITS in
platform_notification_messages.h stay in sync. Do you want to do serialization
to the database in a separate patch, or add it to this CL? (It should be fairly
trivial.)

[Michael van Ouwerkerk, 2016/01/27 14:24:32]

Done.

 };
 
 // Structure representing the information associated with a Web Notification.
 // This struct should include the developer-visible information, kept
 // synchronized with the WebNotificationData structure defined in the Blink API.
 struct CONTENT_EXPORT PlatformNotificationData {
   PlatformNotificationData();
   ~PlatformNotificationData();
 
   // The maximum size of developer-provided data to be stored in the |data|
@@ skipping 43 matching lines @@
   // a serialized string. Must not exceed |kMaximumDeveloperDataSize| bytes.
   std::vector<char> data;
 
   // Actions that should be shown as buttons on the notification.
   std::vector<PlatformNotificationAction> actions;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PLATFORM_NOTIFICATION_DATA_H_