Push API: Return cached registration if available.

content/shell/browser/layout_test/layout_test_push_messaging_service.cc

Index: content/shell/browser/layout_test/layout_test_push_messaging_service.cc
diff --git a/content/shell/browser/layout_test/layout_test_push_messaging_service.cc b/content/shell/browser/layout_test/layout_test_push_messaging_service.cc
index cbbcb2cc170c39ab72281ab10516cfbad2a1d332..e6639c3bd68c41edd1a33adc884ac553f892a306 100644
--- a/content/shell/browser/layout_test/layout_test_push_messaging_service.cc
+++ b/content/shell/browser/layout_test/layout_test_push_messaging_service.cc
@@ -47,7 +47,8 @@ void LayoutTestPushMessagingService::RegisterFromWorker(
     const PushMessagingService::RegisterCallback& callback) {
   if (GetPermissionStatus(requesting_origin, requesting_origin) ==
       blink::WebPushPermissionStatusGranted) {
-    callback.Run("layoutTestRegistrationId", PUSH_REGISTRATION_STATUS_SUCCESS);
+    callback.Run("layoutTestRegistrationId",
+                 PUSH_REGISTRATION_STATUS_SUCCESS_FROM_PUSH_SERVICE);
   } else {
     callback.Run("registration_id", PUSH_REGISTRATION_STATUS_PERMISSION_DENIED);
   }