Update the PushEvent to have a nullable PushMessageData

content/common/service_worker/service_worker_messages.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.
 
 // Message definition file, included multiple times, hence no include guard.
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
 #include "content/common/service_worker/service_worker_client_info.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "content/public/common/message_port_types.h"
 #include "content/public/common/navigator_connect_client.h"
 #include "content/public/common/platform_notification_data.h"
+#include "content/public/common/push_event_payload.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_param_traits.h"
 #include "third_party/WebKit/public/platform/WebCircularGeofencingRegion.h"
 #include "third_party/WebKit/public/platform/WebGeofencingEventType.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerError.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerEventResult.h"
 #include "url/gurl.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
@@ skipping 97 matching lines @@
 
 IPC_ENUM_TRAITS_MAX_VALUE(blink::WebGeofencingEventType,
                           blink::WebGeofencingEventTypeLast)
 
 IPC_STRUCT_TRAITS_BEGIN(content::NavigatorConnectClient)
   IPC_STRUCT_TRAITS_MEMBER(target_url)
   IPC_STRUCT_TRAITS_MEMBER(origin)
   IPC_STRUCT_TRAITS_MEMBER(message_port_id)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(content::PushEventPayload)
+  IPC_STRUCT_TRAITS_MEMBER(data)
+  IPC_STRUCT_TRAITS_MEMBER(is_null)
+IPC_STRUCT_TRAITS_END()
+
 //---------------------------------------------------------------------------
 // Messages sent from the child process to the browser.
 
 IPC_MESSAGE_CONTROL5(ServiceWorkerHostMsg_RegisterServiceWorker,
                      int /* thread_id */,
                      int /* request_id */,
                      int /* provider_id */,
                      GURL /* scope */,
                      GURL /* script_url */)
 
@@ skipping 292 matching lines @@
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_FetchEvent,
                      int /* request_id */,
                      content::ServiceWorkerFetchRequest)
 IPC_MESSAGE_CONTROL4(ServiceWorkerMsg_NotificationClickEvent,
                      int /* request_id */,
                      int64_t /* persistent_notification_id */,
                      content::PlatformNotificationData /* notification_data */,
                      int /* action_index */)
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_PushEvent,
                      int /* request_id */,
-                     std::string /* data */)
+                     content::PushEventPayload /* data */)
 IPC_MESSAGE_CONTROL4(ServiceWorkerMsg_GeofencingEvent,
                      int /* request_id */,
                      blink::WebGeofencingEventType /* event_type */,
                      std::string /* region_id */,
                      blink::WebCircularGeofencingRegion /* region */)
 IPC_MESSAGE_CONTROL3(
     ServiceWorkerMsg_MessageToWorker,
     base::string16 /* message */,
     std::vector<content::TransferredMessagePort> /* sent_message_ports */,
     std::vector<int> /* new_routing_ids */)
@@ skipping 37 matching lines @@
 
 // Sent via EmbeddedWorker as a response of NavigateClient.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_NavigateClientResponse,
                      int /* request_id */,
                      content::ServiceWorkerClientInfo /* client */)
 
 // Sent via EmbeddedWorker as an error response of NavigateClient.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_NavigateClientError,
                      int /* request_id */,
                      GURL /* url */)