Basic HTTP pipelining support

net/http/http_basic_stream.cc

Index: net/http/http_basic_stream.cc
diff --git a/net/http/http_basic_stream.cc b/net/http/http_basic_stream.cc
index eb5ecc2e4f44205ce7dba18a70444463e56a1bbe..43b141a467e5c3878dc2951176acc7ecec380ec4 100644
--- a/net/http/http_basic_stream.cc
+++ b/net/http/http_basic_stream.cc
@@ -11,6 +11,7 @@
 #include "net/base/net_errors.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_request_info.h"
+#include "net/http/http_response_body_drainer.h"
 #include "net/http/http_stream_parser.h"
 #include "net/http/http_util.h"
 #include "net/socket/client_socket_handle.h"
@@ -130,4 +131,10 @@ void HttpBasicStream::LogNumRttVsBytesMetrics() const {
   // Log rtt metrics here.
 }
 
+void HttpBasicStream::Drain(HttpNetworkSession* session) {
+  HttpResponseBodyDrainer* drainer = new HttpResponseBodyDrainer(this);
+  drainer->Start(session);
+  // |drainer| will delete itself.
+}
+
 }  // namespace net