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

content/browser/appcache/appcache_database.h

Index: content/browser/appcache/appcache_database.h
diff --git a/content/browser/appcache/appcache_database.h b/content/browser/appcache/appcache_database.h
index ccfd891abbbd59983e6d5c2ce0d1464def5fce4a..89d7ff93dc2cded542ba3e144e2b919f8ff786b8 100644
--- a/content/browser/appcache/appcache_database.h
+++ b/content/browser/appcache/appcache_database.h
@@ -54,6 +54,8 @@ class CONTENT_EXPORT AppCacheDatabase {
     GURL manifest_url;
     base::Time creation_time;
     base::Time last_access_time;
+    base::Time last_full_update_check_time;
+    base::Time first_evictable_error_time;
   };
 
   struct CONTENT_EXPORT CacheRecord {
@@ -120,6 +122,9 @@ class CONTENT_EXPORT AppCacheDatabase {
       int64 group_id, base::Time last_access_time);
   bool LazyUpdateLastAccessTime(
       int64 group_id, base::Time last_access_time);
+  bool UpdateEvictionTimes(int64 group_id,
+                           base::Time last_full_update_check_time,
+                           base::Time first_evictable_error_time);
   bool CommitLazyLastAccessTimes();  // The destructor calls this too.
   bool InsertGroup(const GroupRecord* record);
   bool DeleteGroup(int64 group_id);