Service Worker: Don't write to disk during update until proven necessary

content/browser/service_worker/service_worker_provider_host.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_PROVIDER_HOST_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 210 matching lines @@
   ServiceWorkerRegistration* MatchRegistration() const;
 
   // Called when our controller has been terminated and doomed due to an
   // exceptional condition like it could no longer be read from the script
   // cache.
   void NotifyControllerLost();
 
  private:
   friend class ServiceWorkerProviderHostTest;
   friend class ServiceWorkerWriteToCacheJobTest;
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest, Update_SameScript);
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest,
+                           Update_SameSizeScript);
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest,
+                           Update_TruncatedScript);
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest,
+                           Update_ElongatedScript);
+  FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest,
+                           Update_EmptyScript);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerContextRequestHandlerTest,
                            UpdateBefore24Hours);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerContextRequestHandlerTest,
                            UpdateAfter24Hours);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerContextRequestHandlerTest,
                            UpdateForceBypassCache);
 
   struct OneShotGetReadyCallback {
     GetRegistrationForReadyCallback callback;
     bool called;
@@ skipping 57 matching lines @@
   bool allow_association_;
 
   std::vector<base::Closure> queued_events_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerProviderHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_