service worker: Bump update time even when the script was identical

content/browser/service_worker/embedded_worker_instance.cc

 // Copyright 2013 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/browser/service_worker/embedded_worker_instance.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/macros.h"
@@ skipping 543 matching lines @@
       "ServiceWorker", "EmbeddedWorkerInstance::Start",
       inflight_start_task_.get(), "OnScriptLoaded", "Source",
       ServiceWorkerMetrics::LoadSourceToString(source));
 
   if (!step_time_.is_null()) {
     base::TimeDelta duration = UpdateStepTime();
     ServiceWorkerMetrics::RecordTimeToLoad(
         duration, source, inflight_start_task_->start_situation());
   }
 
+  starting_phase_ = SCRIPT_LOADED;
   FOR_EACH_OBSERVER(Listener, listener_list_, OnScriptLoaded());
-  starting_phase_ = SCRIPT_LOADED;
+  // |this| may be destroyed by the callback.
 }
 
 void EmbeddedWorkerInstance::OnURLJobCreatedForMainScript() {
   if (!inflight_start_task_)
     return;
   TRACE_EVENT_ASYNC_STEP_PAST0("ServiceWorker", "EmbeddedWorkerInstance::Start",
                                inflight_start_task_.get(), "OnURLJobCreated");
   if (!step_time_.is_null()) {
     base::TimeDelta duration = UpdateStepTime();
     if (inflight_start_task_->is_installed())
@@ skipping 234 matching lines @@
     case SCRIPT_READ_FINISHED:
       return "Script read finished";
     case STARTING_PHASE_MAX_VALUE:
       NOTREACHED();
   }
   NOTREACHED() << phase;
   return std::string();
 }
 
 }  // namespace content