Shows the error message while fetching the SW script in the DevTools console.

content/browser/service_worker/embedded_worker_instance.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_INSTANCE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_INSTANCE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "content/browser/service_worker/service_worker_metrics.h"
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_status_code.h"
+#include "content/public/common/console_message_level.h"
 #include "url/gurl.h"
 
 // Windows headers will redefine SendMessage.
 #ifdef SendMessage
 #undef SendMessage
 #endif
 
 struct EmbeddedWorkerMsg_StartWorker_Params;
 
 namespace IPC {
@@ skipping 137 matching lines @@
   // Called when the worker is installed.
   void OnWorkerVersionInstalled();
 
   // Called when the worker is doomed.
   void OnWorkerVersionDoomed();
 
   // Called when the net::URLRequestJob to load the service worker script
   // created. Not called for import scripts.
   void OnURLJobCreatedForMainScript();
 
+  // Add message to the devtools console.
+  void AddMessageToConsole(ConsoleMessageLevel level,
+                           const std::string& message);
+
   static std::string StatusToString(Status status);
   static std::string StartingPhaseToString(StartingPhase phase);
 
   void Detach();
 
   base::WeakPtr<EmbeddedWorkerInstance> AsWeakPtr();
 
  private:
   typedef base::ObserverList<Listener> ListenerList;
   class DevToolsProxy;
@@ skipping 115 matching lines @@
   base::TimeTicks step_time_;
 
   base::WeakPtrFactory<EmbeddedWorkerInstance> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EmbeddedWorkerInstance);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_INSTANCE_H_