Implement SSLClientSocketPool.

net/socket/client_socket_pool_base.h

 // Copyright (c) 2010 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.
 //
 // A ClientSocketPoolBase is used to restrict the number of sockets open at
 // a time.  It also maintains a list of idle persistent sockets for reuse.
 // Subclasses of ClientSocketPool should compose ClientSocketPoolBase to handle
 // the core logic of (1) restricting the number of active (connected or
 // connecting) sockets per "group" (generally speaking, the hostname), (2)
 // maintaining a per-group list of idle, persistent sockets for reuse, and (3)
@@ skipping 72 matching lines @@
   // Begins connecting the socket.  Returns OK on success, ERR_IO_PENDING if it
   // cannot complete synchronously without blocking, or another net error code
   // on error.  In asynchronous completion, the ConnectJob will notify
   // |delegate_| via OnConnectJobComplete.  In both asynchronous and synchronous
   // completion, ReleaseSocket() can be called to acquire the connected socket
   // if it succeeded.
   int Connect();
 
   virtual LoadState GetLoadState() const = 0;
 
+  // If Connect returns an error (or OnConnectJobComplete reports an error
+  // result) this method will be called, allowing the pool to add
+  // additional error state to the ClientSocketHandle (post late-binding).
+  virtual void GetAdditionalErrorState(ClientSocketHandle* handle) {}
+
  protected:
   void set_socket(ClientSocket* socket);
   ClientSocket* socket() { return socket_.get(); }
   void NotifyDelegateOfCompletion(int rv);
   void ResetTimer(base::TimeDelta remainingTime);
 
  private:
   virtual int ConnectInternal() = 0;
 
   void LogConnectStart();
@@ skipping 506 matching lines @@
   // ClientSocketPoolBase<T> reference to drop to zero.  While we're deep
   // in cleanup code, we'll often hold a reference to |self|.
   scoped_refptr<internal::ClientSocketPoolBaseHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSocketPoolBase);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_CLIENT_SOCKET_POOL_BASE_H_