Defend against selectCache() being called multiple times....

webkit/appcache/appcache_host.h

 // Copyright (c) 2010 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 WEBKIT_APPCACHE_APPCACHE_HOST_H_
 #define WEBKIT_APPCACHE_APPCACHE_HOST_H_
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/observer_list.h"
@@ skipping 156 matching lines @@
   scoped_refptr<AppCache> swappable_cache_;
 
   // Keep a reference to the group being updated until the update completes.
   scoped_refptr<AppCacheGroup> group_being_updated_;
 
   // Similarly, keep a reference to the newest cache of the group until the
   // update completes. When adding a new master entry to a cache that is not
   // in use in any other host, this reference keeps the cache in  memory.
   scoped_refptr<AppCache> newest_cache_of_group_being_updated_;
 
+  // We defend against multiple calls to SelectCache() which should not happen.
+  bool was_select_cache_called_;
+
   // Keep a reference to the cache of the main resource so it survives frame
   // navigations.
   scoped_refptr<AppCache> main_resource_cache_;
   int64 pending_main_resource_cache_id_;
 
   // Cache loading is async, if we're loading a specific cache or group
   // for the purposes of cache selection, one or the other of these will
   // indicate which cache or group is being loaded.
   int64 pending_selected_cache_id_;
   GURL pending_selected_manifest_url_;
@@ skipping 44 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, SetSwappableCache);
   FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, ForDedicatedWorker);
   FRIEND_TEST_ALL_PREFIXES(AppCacheGroupTest, QueueUpdate);
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheHost);
 };
 
 }  // namespace appcache
 
 #endif  // WEBKIT_APPCACHE_APPCACHE_HOST_H_