Reporting: Cap number of clients in cache.

net/reporting/reporting_policy.h

 // Copyright 2017 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 NET_REPORTING_REPORTING_POLICY_H_
 #define NET_REPORTING_REPORTING_POLICY_H_
 
 #include "base/time/time.h"
 #include "net/base/backoff_entry.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 // Various policy knobs for the Reporting system.
 struct NET_EXPORT ReportingPolicy {
   // Provides a reasonable default for use in a browser embedder.
   ReportingPolicy();
   ReportingPolicy(const ReportingPolicy& other);
   ~ReportingPolicy();
 
   // Maximum number of reports to queue before evicting the oldest.
   size_t max_report_count;
 
+  // Maximum number of clients to remember before evicting least-recently-used.
+  size_t max_client_count;
+
   // Minimum interval at which to attempt delivery of queued reports.
   base::TimeDelta delivery_interval;
 
   // Backoff policy for failing endpoints.
   BackoffEntry::Policy endpoint_backoff_policy;
 
   // Minimum interval at which Reporting will persist state to (relatively)
   // stable storage to be restored if the embedder restarts.
   base::TimeDelta persistence_interval;
 
@@ skipping 19 matching lines @@
   bool clear_reports_on_network_changes;
 
   // Whether to clear clients when the network changes to avoid leaking browsing
   // data between networks.
   bool clear_clients_on_network_changes;
 };
 
 }  // namespace net
 
 #endif  // NET_REPORTING_REPORTING_POLICY_H_