Add testing for subscription from service workers

content/renderer/push_messaging/push_messaging_dispatcher.cc

 // 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.
 
 #include "content/renderer/push_messaging/push_messaging_dispatcher.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/child/service_worker/web_service_worker_registration_impl.h"
 #include "content/common/push_messaging_messages.h"
 #include "content/renderer/manifest/manifest_manager.h"
@@ skipping 37 matching lines @@
   // fetching the manifest.
   if (options.applicationServerKey.isEmpty()) {
     RenderFrameImpl::FromRoutingID(routing_id())
         ->manifest_manager()
         ->GetManifest(base::Bind(
             &PushMessagingDispatcher::DidGetManifest, base::Unretained(this),
             service_worker_registration, options, callbacks));
   } else {
     PushSubscriptionOptions content_options;
     content_options.user_visible_only = options.userVisibleOnly;
-    content_options.sender_info = options.applicationServerKey.utf8();
+    // Just treat the server key as a string of bytes and pass it to the push
+    // service.
+    content_options.sender_info = options.applicationServerKey.latin1();
     DoSubscribe(service_worker_registration, content_options, callbacks);
   }
 }
 
 void PushMessagingDispatcher::DidGetManifest(
     blink::WebServiceWorkerRegistration* service_worker_registration,
     const blink::WebPushSubscriptionOptions& options,
     blink::WebPushSubscriptionCallbacks* callbacks,
     const Manifest& manifest) {
   // Get the sender_info from the manifest since it wasn't provided by
@@ skipping 62 matching lines @@
           : blink::WebPushError::ErrorTypeAbort;
 
   callbacks->onError(blink::WebPushError(
       error_type,
       blink::WebString::fromUTF8(PushRegistrationStatusToString(status))));
 
   subscription_callbacks_.Remove(request_id);
 }
 
 }  // namespace content