[ServiceWorkerCacheStorage] Add support for new Open method.

content/browser/service_worker/service_worker_cache_storage.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_CACHE_STORAGE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CACHE_STORAGE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 41 matching lines @@
   ServiceWorkerCacheStorage(
       const base::FilePath& origin_path,
       bool memory_only,
       base::SequencedTaskRunner* cache_task_runner,
       net::URLRequestContext* request_context,
       base::WeakPtr<storage::BlobStorageContext> blob_context);
 
   virtual ~ServiceWorkerCacheStorage();
 
   // Create a ServiceWorkerCache if it doesn't already exist and call the
-  // callback with the cache's id. If it already
+  // callback with the cache. If it already
   // exists the callback is called with CACHE_STORAGE_ERROR_EXISTS.
   void CreateCache(const std::string& cache_name,
                    const CacheAndErrorCallback& callback);
 
-  // Get the cache id for the given key. If not found returns
+  // Get the cache for the given key. If not found returns
   // CACHE_STORAGE_ERROR_NOT_FOUND.
   void GetCache(const std::string& cache_name,
                 const CacheAndErrorCallback& callback);
 
+  // Get the cache for the given key. If the cache is not found it is
+  // created.
+  void OpenCache(const std::string& cache_name,
+                 const CacheAndErrorCallback& callback);
+
   // Calls the callback with whether or not the cache exists.
   void HasCache(const std::string& cache_name,
                 const BoolAndErrorCallback& callback);
 
   // Deletes the cache if it exists. If it doesn't exist,
   // CACHE_STORAGE_ERROR_NOT_FOUND is returned.
   void DeleteCache(const std::string& cache_name,
                    const BoolAndErrorCallback& callback);
 
   // Calls the callback with a vector of cache names (keys) available.
@@ skipping 64 matching lines @@
   scoped_ptr<CacheLoader> cache_loader_;
 
   base::WeakPtrFactory<ServiceWorkerCacheStorage> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerCacheStorage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CACHE_STORAGE_H_