Added a net::BidirectionalStream to expose a bidirectional streaming interface

net/http/http_stream_factory_impl.h

Index: net/http/http_stream_factory_impl.h
diff --git a/net/http/http_stream_factory_impl.h b/net/http/http_stream_factory_impl.h
index da1de9797a7378440aac2a39943df260fcffb4f5..30ab4429504499f535da688366ff7c4bdc59a914 100644
--- a/net/http/http_stream_factory_impl.h
+++ b/net/http/http_stream_factory_impl.h
@@ -51,6 +51,14 @@ class NET_EXPORT_PRIVATE HttpStreamFactoryImpl : public HttpStreamFactory {
       WebSocketHandshakeStreamBase::CreateHelper* create_helper,
       const BoundNetLog& net_log) override;
 
+  HttpStreamRequest* RequestBidirectionalStreamJob(
+      const HttpRequestInfo& info,
+      RequestPriority priority,
+      const SSLConfig& server_ssl_config,
+      const SSLConfig& proxy_ssl_config,
+      HttpStreamRequest::Delegate* delegate,
+      const BoundNetLog& net_log) override;
+
   void PreconnectStreams(int num_streams,
                          const HttpRequestInfo& info,
                          const SSLConfig& server_ssl_config,