test for https://codereview.chromium.org/419693002/

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 22 matching lines @@
 
   // Used to retrieve the results of the initial run of a new version.
   bool HasError() const { return has_error_; }
   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_ids_.size(); }
+
  private:
   typedef std::map<GURL, int64> ResourceIDMap;
 
   // 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_;
   ResourceIDMap resource_ids_;
   bool has_error_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerScriptCacheMap);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SCRIPT_CACHE_MAP_H_