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 6fe83ddfd4f01b27cfdbf12e955eec5f0abc7386..31d21cb73c8600876d05351da51840c7a8610a55 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,
@@ -202,6 +203,8 @@ class NET_EXPORT_PRIVATE HttpProxyClientSocketPool : public ClientSocketPool {
 
   virtual void Flush() OVERRIDE;
 
+  virtual bool IsStalled() const OVERRIDE;
+
   virtual void CloseIdleSockets() OVERRIDE;
 
   virtual int IdleSocketCount() const OVERRIDE;
@@ -213,6 +216,10 @@ class NET_EXPORT_PRIVATE HttpProxyClientSocketPool : public ClientSocketPool {
       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,
@@ -222,6 +229,9 @@ class NET_EXPORT_PRIVATE HttpProxyClientSocketPool : public ClientSocketPool {
 
   virtual ClientSocketPoolHistograms* histograms() const OVERRIDE;
 
+  // LayeredPool methods:
+  virtual bool CloseOneIdleConnection() OVERRIDE;
+
  private:
   typedef ClientSocketPoolBase<HttpProxySocketParams> PoolBase;