[DOMStorage] Rate limiting writes to disk.

content/common/dom_storage/dom_storage_map.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_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
 #define CONTENT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 28 matching lines @@
   void ExtractValues(DOMStorageValuesMap* map) const { *map = values_; }
 
   // Creates a new instance of DOMStorageMap containing
   // a deep copy of values_.
   DOMStorageMap* DeepCopy() const;
 
   size_t bytes_used() const { return bytes_used_; }
   size_t quota() const { return quota_; }
   void set_quota(size_t quota) { quota_ = quota; }
 
+  static size_t CountBytes(const DOMStorageValuesMap& values);
+
  private:
   friend class base::RefCountedThreadSafe<DOMStorageMap>;
   ~DOMStorageMap();
 
   void ResetKeyIterator();
 
   DOMStorageValuesMap values_;
   DOMStorageValuesMap::const_iterator key_iterator_;
   unsigned last_key_index_;
   size_t bytes_used_;
   size_t quota_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_