Service Worker: Use more specific errors when StartWorker fails

content/browser/service_worker/service_worker_version.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_SERVICE_WORKER_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <map>
 #include <queue>
 #include <set>
@@ skipping 460 matching lines @@
   void RemoveCallbackAndStopIfDoomed(IDMAP* callbacks, int request_id);
 
   template <typename CallbackType>
   int AddRequest(const CallbackType& callback,
                  IDMap<CallbackType, IDMapOwnPointer>* callback_map,
                  RequestType request_type);
 
   bool OnRequestTimeout(const RequestInfo& info);
   void SetAllRequestTimes(const base::TimeTicks& ticks);
 
+  // Returns the reason the embedded worker failed to start, using information
+  // inaccessible to EmbeddedWorkerInstance. Returns |default_code| if it can't
+  // deduce a reason.
+  ServiceWorkerStatusCode DeduceStartWorkerFailureReason(
+      ServiceWorkerStatusCode default_code);
+
   const int64 version_id_;
   int64 registration_id_;
   GURL script_url_;
   GURL scope_;
   Status status_;
   scoped_ptr<EmbeddedWorkerInstance> embedded_worker_;
   std::vector<StatusCallback> start_callbacks_;
   std::vector<StatusCallback> stop_callbacks_;
   std::vector<base::Closure> status_change_callbacks_;
 
@@ skipping 43 matching lines @@
   scoped_ptr<net::HttpResponseInfo> main_script_http_info_;
 
   base::WeakPtrFactory<ServiceWorkerVersion> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerVersion);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_