Close idle connections / SPDY sessions when needed.

net/http/http_proxy_client_socket_pool.h

Index: net/http/http_proxy_client_socket_pool.h
diff --git a/net/http/http_proxy_client_socket_pool.h b/net/http/http_proxy_client_socket_pool.h
index 66897d219e1db66c4dc39ece1c4b0f14acf8f0e3..22aa523d1a20f1b19d61166c659a46ef7cd38376 100644
--- a/net/http/http_proxy_client_socket_pool.h
+++ b/net/http/http_proxy_client_socket_pool.h
@@ -167,7 +167,8 @@ class HttpProxyConnectJob : public ConnectJob {
   DISALLOW_COPY_AND_ASSIGN(HttpProxyConnectJob);
 };
 
-class NET_EXPORT_PRIVATE HttpProxyClientSocketPool : public ClientSocketPool {
+class NET_EXPORT_PRIVATE HttpProxyClientSocketPool
+    : public ClientSocketPool, public LayeredPool {
  public:
   HttpProxyClientSocketPool(
       int max_sockets,
@@ -186,39 +187,50 @@ class NET_EXPORT_PRIVATE HttpProxyClientSocketPool : public ClientSocketPool {
                             RequestPriority priority,
                             ClientSocketHandle* handle,
                             OldCompletionCallback* callback,
-                            const BoundNetLog& net_log);
+                            const BoundNetLog& net_log) OVERRIDE;
 
   virtual void RequestSockets(const std::string& group_name,
                               const void* params,
                               int num_sockets,
-                              const BoundNetLog& net_log);
+                              const BoundNetLog& net_log) OVERRIDE;
 
   virtual void CancelRequest(const std::string& group_name,
-                             ClientSocketHandle* handle);
+                             ClientSocketHandle* handle) OVERRIDE;
 
   virtual void ReleaseSocket(const std::string& group_name,
                              StreamSocket* socket,
-                             int id);
+                             int id) OVERRIDE;
 
-  virtual void Flush();
+  virtual void Flush() OVERRIDE;
 
-  virtual void CloseIdleSockets();
+  virtual bool IsStalled() const OVERRIDE;
 
-  virtual int IdleSocketCount() const;
+  virtual void CloseIdleSockets() OVERRIDE;
 
-  virtual int IdleSocketCountInGroup(const std::string& group_name) const;
+  virtual int IdleSocketCount() const OVERRIDE;
 
-  virtual LoadState GetLoadState(const std::string& group_name,
-                                 const ClientSocketHandle* handle) const;
+  virtual int IdleSocketCountInGroup(
+      const std::string& group_name) const OVERRIDE;
+
+  virtual LoadState GetLoadState(
+      const std::string& group_name,
+      const ClientSocketHandle* handle) const OVERRIDE;
+
+  virtual void AddLayeredPool(LayeredPool* layered_pool) OVERRIDE;
+
+  virtual void RemoveLayeredPool(LayeredPool* layered_pool) OVERRIDE;
 
   virtual base::DictionaryValue* GetInfoAsValue(
       const std::string& name,
       const std::string& type,
-      bool include_nested_pools) const;
+      bool include_nested_pools) const OVERRIDE;
+
+  virtual base::TimeDelta ConnectionTimeout() const OVERRIDE;
 
-  virtual base::TimeDelta ConnectionTimeout() const;
+  virtual ClientSocketPoolHistograms* histograms() const OVERRIDE;
 
-  virtual ClientSocketPoolHistograms* histograms() const;
+  // LayeredPool methods:
+  virtual bool CloseOneIdleConnection() OVERRIDE;
 
  private:
   typedef ClientSocketPoolBase<HttpProxySocketParams> PoolBase;