Close idle sockets next time we are about to send data.

net/socket/client_socket_pool_base.h

Index: net/socket/client_socket_pool_base.h
diff --git a/net/socket/client_socket_pool_base.h b/net/socket/client_socket_pool_base.h
index 9e46e5eabd885c7f9c541b7b5b8b760ad2ddecf8..970ae63b386694f159425515b253756c8970fd04 100644
--- a/net/socket/client_socket_pool_base.h
+++ b/net/socket/client_socket_pool_base.h
@@ -293,6 +293,14 @@ class NET_EXPORT_PRIVATE ClientSocketPoolBaseHelper
 
   bool HasGroup(const std::string& group_name) const;
 
+  // Called to enable/disable cleaning up idle sockets. When enabled,
+  // idle sockets that have been around for longer than a period defined
+  // by kCleanupInterval are cleaned up using a timer. Otherwise they are
+  // closed next time client makes a request. This may reduce network
+  // activity and power consumption.
+  static bool cleanup_timer_enabled();
+  static bool set_cleanup_timer_enabled(bool enabled);
+
   // Closes all idle sockets if |force| is true.  Else, only closes idle
   // sockets that timed out or can't be reused.  Made public for testing.
   void CleanupIdleSockets(bool force);
@@ -442,6 +450,9 @@ class NET_EXPORT_PRIVATE ClientSocketPoolBaseHelper
   void IncrementIdleCount();
   void DecrementIdleCount();
 
+  // Start cleanup timer for idle sockets.
+  void StartIdleSocketTimer();
+
   // Scans the group map for groups which have an available socket slot and
   // at least one pending request. Returns true if any groups are stalled, and
   // if so, fills |group| and |group_name| with data of the stalled group
@@ -552,6 +563,9 @@ class NET_EXPORT_PRIVATE ClientSocketPoolBaseHelper
   // The maximum number of sockets kept per group.
   const int max_sockets_per_group_;
 
+  // Whether to use timer to cleanup idle sockets.
+  bool use_cleanup_timer_;
+
   // The time to wait until closing idle sockets.
   const base::TimeDelta unused_idle_socket_timeout_;
   const base::TimeDelta used_idle_socket_timeout_;