[ServiceWorkerCache] Cache and CacheStorage creation UMA

content/browser/service_worker/service_worker_cache.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_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CACHE_H_
 
 #include <list>
 
 #include "base/callback.h"
@@ skipping 22 matching lines @@
 class ServiceWorkerCacheScheduler;
 class TestServiceWorkerCache;
 
 // Represents a ServiceWorker Cache as seen in
 // https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html.
 // The asynchronous methods are executed serially. Callbacks to the
 // public functions will be called so long as the cache object lives.
 class CONTENT_EXPORT ServiceWorkerCache
     : public base::RefCounted<ServiceWorkerCache> {
  public:
+  // This enum is used in histograms, so do not change the ordering and always
+  // append new types to the end.
   enum ErrorType {
-    ErrorTypeOK = 0,
-    ErrorTypeExists,
-    ErrorTypeStorage,
-    ErrorTypeNotFound
+    ERROR_TYPE_OK = 0,
+    ERROR_TYPE_EXISTS,
+    ERROR_TYPE_STORAGE,
+    ERROR_TYPE_NOT_FOUND,
+    ERROR_TYPE_LAST = ERROR_TYPE_NOT_FOUND
   };
 
   enum EntryIndex { INDEX_HEADERS = 0, INDEX_RESPONSE_BODY };
   typedef base::Callback<void(ErrorType)> ErrorCallback;
   typedef base::Callback<void(ErrorType,
                               scoped_ptr<ServiceWorkerResponse>,
                               scoped_ptr<storage::BlobDataHandle>)>
       ResponseCallback;
   typedef std::vector<ServiceWorkerFetchRequest> Requests;
   typedef base::Callback<void(ErrorType, scoped_ptr<Requests>)>
       RequestsCallback;
 
   static scoped_refptr<ServiceWorkerCache> CreateMemoryCache(
       const GURL& origin,
       net::URLRequestContext* request_context,
       const scoped_refptr<storage::QuotaManagerProxy>& quota_manager_proxy,
       base::WeakPtr<storage::BlobStorageContext> blob_context);
   static scoped_refptr<ServiceWorkerCache> CreatePersistentCache(
       const GURL& origin,
       const base::FilePath& path,
       net::URLRequestContext* request_context,
       const scoped_refptr<storage::QuotaManagerProxy>& quota_manager_proxy,
       base::WeakPtr<storage::BlobStorageContext> blob_context);
 
-  // Returns ErrorTypeNotFound if not found.
+  // Returns ERROR_TYPE_NOT_FOUND if not found.
   void Match(scoped_ptr<ServiceWorkerFetchRequest> request,
              const ResponseCallback& callback);
 
   // Puts the request and response object in the cache. The response body (if
   // present) is stored in the cache, but not the request body. Returns
-  // ErrorTypeOK on success.
+  // ERROR_TYPE_OK on success.
   void Put(scoped_ptr<ServiceWorkerFetchRequest> request,
            scoped_ptr<ServiceWorkerResponse> response,
            const ResponseCallback& callback);
 
   // Returns ErrorNotFound if not found. Otherwise deletes and returns
-  // ErrorTypeOK.
+  // ERROR_TYPE_OK.
   void Delete(scoped_ptr<ServiceWorkerFetchRequest> request,
               const ErrorCallback& callback);
 
   // TODO(jkarlin): Have keys take an optional ServiceWorkerFetchRequest.
   // Returns ErrorTypeOK and a vector of requests if there are no errors.
   void Keys(const RequestsCallback& callback);
 
   // Closes the backend. Future operations that require the backend
   // will exit early. Close should only be called once per ServiceWorkerCache.
   void Close(const base::Closure& callback);
@@ skipping 115 matching lines @@
   bool memory_only_;
 
   base::WeakPtrFactory<ServiceWorkerCache> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerCache);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CACHE_H_