Service Worker: Improve error messages from register().

content/browser/service_worker/service_worker_script_cache_map.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SCRIPT_CACHE_MAP_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SCRIPT_CACHE_MAP_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 17 matching lines @@
   int64 LookupResourceId(const GURL& url);
   // A size of -1 means that we don't know the size yet
   // (it has not finished caching).
   int64 LookupResourceSize(const GURL& url);
 
   // Used during the initial run of a new version to build the map
   // of resources ids.
   void NotifyStartedCaching(const GURL& url, int64 resource_id);
   void NotifyFinishedCaching(const GURL& url,
                              int64 size_bytes,
-                             const net::URLRequestStatus& status);
+                             const net::URLRequestStatus& status,
+                             const std::string& status_message);
 
   // Used to retrieve the results of the initial run of a new version.
   void GetResources(
       std::vector<ServiceWorkerDatabase::ResourceRecord>* resources);
 
   // Used when loading an existing version.
   void SetResources(
      const std::vector<ServiceWorkerDatabase::ResourceRecord>& resources);
 
   size_t size() const { return resource_map_.size(); }
 
   const net::URLRequestStatus& main_script_status() const {
     return main_script_status_;
   }
 
+  const std::string& main_script_status_message() const {
+    return main_script_status_message_;
+  }
+
  private:
   typedef std::map<GURL, ServiceWorkerDatabase::ResourceRecord> ResourceMap;
 
   // The version objects owns its script cache and provides a rawptr to it.
   friend class ServiceWorkerVersion;
   ServiceWorkerScriptCacheMap(
       ServiceWorkerVersion* owner,
       base::WeakPtr<ServiceWorkerContextCore> context);
   ~ServiceWorkerScriptCacheMap();
 
   ServiceWorkerVersion* owner_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
   ResourceMap resource_map_;
   net::URLRequestStatus main_script_status_;
+  std::string main_script_status_message_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerScriptCacheMap);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SCRIPT_CACHE_MAP_H_