Basic HTTP pipelining support

net/http/http_network_session.h

Index: net/http/http_network_session.h
diff --git a/net/http/http_network_session.h b/net/http/http_network_session.h
index c65b48083dd9ff14a1569f3b3bd2dd449c3de3d8..5cf464e0ca4223e57bd3f673d503359c88489293 100644
--- a/net/http/http_network_session.h
+++ b/net/http/http_network_session.h
@@ -14,6 +14,7 @@
 #include "net/base/net_export.h"
 #include "net/base/ssl_client_auth_cache.h"
 #include "net/http/http_auth_cache.h"
+#include "net/http/http_pipelined_host_pool.h"
 #include "net/http/http_stream_factory.h"
 #include "net/socket/client_socket_pool_manager.h"
 #include "net/spdy/spdy_session_pool.h"
@@ -109,6 +110,9 @@ class NET_EXPORT HttpNetworkSession
   ProxyService* proxy_service() { return proxy_service_; }
   SSLConfigService* ssl_config_service() { return ssl_config_service_; }
   SpdySessionPool* spdy_session_pool() { return &spdy_session_pool_; }
+  HttpPipelinedHostPool* http_pipelined_host_pool() {
+    return &http_pipelined_host_pool_;
+  }
   HttpAuthHandlerFactory* http_auth_handler_factory() {
     return http_auth_handler_factory_;
   }
@@ -157,6 +161,7 @@ class NET_EXPORT HttpNetworkSession
   ClientSocketPoolManager socket_pool_manager_;
   SpdySessionPool spdy_session_pool_;
   scoped_ptr<HttpStreamFactory> http_stream_factory_;
+  HttpPipelinedHostPool http_pipelined_host_pool_;
   std::set<HttpResponseBodyDrainer*> response_drainers_;
 };