Slow start pipelining.

net/http/http_pipelined_connection.h

 // Copyright (c) 2011 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.
 
 #ifndef NET_HTTP_HTTP_PIPELINED_CONNECTION_H_
 #define NET_HTTP_HTTP_PIPELINED_CONNECTION_H_
 #pragma once
 
 #include "net/base/net_export.h"
 #include "net/base/net_log.h"
 
 namespace net {
 
 class BoundNetLog;
 class ClientSocketHandle;
 class HttpPipelinedStream;
 class ProxyInfo;
 struct SSLConfig;
 
 class NET_EXPORT_PRIVATE HttpPipelinedConnection {
  public:
+  enum Feedback {
+    OK,
+    SOCKET_ERROR,
+    OLD_HTTP_VERSION,
+    MUST_CLOSE_CONNECTION,
+  };
+
   class Delegate {
    public:
     // Called when a pipeline has newly available capacity. This may be because
     // the first request has been sent and the pipeline is now active. Or, it
     // may be because a request successfully completed.
     virtual void OnPipelineHasCapacity(HttpPipelinedConnection* pipeline) = 0;
+
+    // Called every time a pipeline receives headers. Lets the delegate know if
+    // the headers indicate that pipelining can be used.
+    virtual void OnPipelineFeedback(HttpPipelinedConnection* pipeline,
+                                    Feedback feedback) = 0;
   };
 
   class Factory {
    public:
     virtual ~Factory() {}
 
     virtual HttpPipelinedConnection* CreateNewPipeline(
         ClientSocketHandle* connection,
         Delegate* delegate,
         const SSLConfig& used_ssl_config,
@@ skipping 27 matching lines @@
   // The source of this pipelined connection.
   virtual const NetLog::Source& source() const = 0;
 
   // True if this connection was NPN negotiated.
   virtual bool was_npn_negotiated() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_PIPELINED_CONNECTION_H_