Expire appcaches that fail to update for "too long".

content/browser/appcache/appcache_storage.h

 // Copyright (c) 2012 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_APPCACHE_APPCACHE_STORAGE_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 133 matching lines @@
   // will be marked. There is no delegate completion callback.
   virtual void MarkEntryAsForeign(const GURL& entry_url, int64 cache_id) = 0;
 
   // Schedules a task to update persistent storage and doom the group and all
   // related caches and responses for deletion. Upon completion the in-memory
   // instance is marked as obsolete and the delegate callback is called.
   virtual void MakeGroupObsolete(AppCacheGroup* group,
                                  Delegate* delegate,
                                  int response_code) = 0;
 
+  // Schedules a tast to update persistent storage with the times of the first

[jsbell, 2015/05/27 22:38:18]

typo: tast->task

+  // evictable error and last successful full update check.
+  virtual void StoreEvictionTimes(AppCacheGroup* group) {}
+
   // Cancels all pending callbacks for the delegate. The delegate callbacks
   // will not be invoked after, however any scheduled operations will still
   // take place. The callbacks for subsequently scheduled operations are
   // unaffected.
   void CancelDelegateCallbacks(Delegate* delegate) {
     DelegateReference* delegate_reference = GetDelegateReference(delegate);
     if (delegate_reference)
       delegate_reference->CancelReference();
   }
 
@@ skipping 160 matching lines @@
 
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheStorageTest, DelegateReferences);
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheStorageTest, UsageMap);
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheStorage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_