Change how the quota system computes the total poolsize for temporary storage

storage/browser/quota/client_usage_tracker.h

 // Copyright 2014 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 STORAGE_BROWSER_QUOTA_CLIENT_USAGE_TRACKER_H_
 #define STORAGE_BROWSER_QUOTA_CLIENT_USAGE_TRACKER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 34 matching lines @@
                      QuotaClient* client,
                      StorageType type,
                      SpecialStoragePolicy* special_storage_policy,
                      StorageMonitor* storage_monitor);
   ~ClientUsageTracker() override;
 
   void GetGlobalLimitedUsage(const UsageCallback& callback);
   void GetGlobalUsage(const GlobalUsageCallback& callback);
   void GetHostUsage(const std::string& host, const UsageCallback& callback);
   void UpdateUsageCache(const GURL& origin, int64_t delta);
+  int64_t GetCachedUsage() const;
   void GetCachedHostsUsage(std::map<std::string, int64_t>* host_usage) const;
   void GetCachedOriginsUsage(std::map<GURL, int64_t>* origin_usage) const;
   void GetCachedOrigins(std::set<GURL>* origins) const;
   bool IsUsageCacheEnabledForOrigin(const GURL& origin) const;
   void SetUsageCacheEnabled(const GURL& origin, bool enabled);
 
  private:
   typedef CallbackQueueMap<HostUsageAccumulator, std::string, int64_t, int64_t>
       HostUsageAccumulatorMap;
 
@@ skipping 65 matching lines @@
   HostUsageAccumulatorMap host_usage_accumulators_;
 
   scoped_refptr<SpecialStoragePolicy> special_storage_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientUsageTracker);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_QUOTA_CLIENT_USAGE_TRACKER_H_