Revert 129277 - Revert 127893 - Attempting to re-land the feature.

net/socket/client_socket_handle.h

Index: net/socket/client_socket_handle.h
===================================================================
--- net/socket/client_socket_handle.h	(revision 129292)
+++ net/socket/client_socket_handle.h	(working copy)
@@ -92,6 +92,10 @@
   // initialized the ClientSocketHandle.
   LoadState GetLoadState() const;
 
+  bool IsPoolStalled() const;
+
+  void AddLayeredPool(LayeredPool* layered_pool);
+
   // Returns true when Init() has completed successfully.
   bool is_initialized() const { return is_initialized_; }
 
@@ -164,6 +168,7 @@
 
   bool is_initialized_;
   ClientSocketPool* pool_;
+  LayeredPool* layered_pool_;
   scoped_ptr<StreamSocket> socket_;
   std::string group_name_;
   bool is_reused_;