Update the PushEvent to have a nullable PushMessageData

content/browser/push_messaging/push_messaging_router.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_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_ROUTER_H_
 #define CONTENT_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_ROUTER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "content/public/common/push_messaging_status.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerEventResult.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class BrowserContext;
+struct PushEventPayload;
 class ServiceWorkerContextWrapper;
 class ServiceWorkerRegistration;
 class ServiceWorkerVersion;
 
 class PushMessagingRouter {
  public:
   typedef base::Callback<void(PushDeliveryStatus)> DeliverMessageCallback;
 
   // Delivers a push message with |data| to the Service Worker identified by
   // |origin| and |service_worker_registration_id|. Must be called on the UI
   // thread.
   static void DeliverMessage(
       BrowserContext* browser_context,
       const GURL& origin,
       int64_t service_worker_registration_id,
-      const std::string& data,
+      const PushEventPayload& payload,
       const DeliverMessageCallback& deliver_message_callback);
 
  private:
   // Attempts to find a Service Worker registration so that a push event can be
   // dispatched. Must be called on the IO thread.
   static void FindServiceWorkerRegistration(
       const GURL& origin,
       int64_t service_worker_registration_id,
-      const std::string& data,
+      const PushEventPayload& payload,
       const DeliverMessageCallback& deliver_message_callback,
       scoped_refptr<ServiceWorkerContextWrapper> service_worker_context);
 
   // If a registration was successfully retrieved, dispatches a push event with
   // |data| on the Service Worker identified by |service_worker_registration|.
   // Must be called on the IO thread.
   static void FindServiceWorkerRegistrationCallback(
-      const std::string& data,
+      const PushEventPayload& payload,
       const DeliverMessageCallback& deliver_message_callback,
       ServiceWorkerStatusCode service_worker_status,
       const scoped_refptr<ServiceWorkerRegistration>&
           service_worker_registration);
 
   // Delivers a push message with |data| to a specific |service_worker|. Must be
   // called on the IO thread, with the the worker running.
   static void DeliverMessageToWorker(
       const scoped_refptr<ServiceWorkerVersion>& service_worker,
       const scoped_refptr<ServiceWorkerRegistration>&
           service_worker_registration,
-      const std::string& data,
+      const PushEventPayload& data,

[Peter Beverloo, 2016/01/27 12:33:54]

nit: s/data/payload/?

[harkness, 2016/01/27 17:49:07]

Done.

       const DeliverMessageCallback& deliver_message_callback);
 
   // Gets called asynchronously after the Service Worker has dispatched the push
   // event. Must be called on the IO thread.
   static void DeliverMessageEnd(
       const DeliverMessageCallback& deliver_message_callback,
       const scoped_refptr<ServiceWorkerRegistration>&
           service_worker_registration,
       ServiceWorkerStatusCode service_worker_status);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PushMessagingRouter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_ROUTER_H_