Basic HTTP pipelining support

net/http/http_pipelined_connection.h

Index: net/http/http_pipelined_connection.h
diff --git a/net/http/http_pipelined_connection.h b/net/http/http_pipelined_connection.h
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+// 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:
+  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;
+  };
+
+  class Factory {
+   public:
+    virtual ~Factory() {}
+
+    virtual HttpPipelinedConnection* CreateNewPipeline(
+        ClientSocketHandle* connection,
+        Delegate* delegate,
+        const SSLConfig& used_ssl_config,
+        const ProxyInfo& used_proxy_info,
+        const BoundNetLog& net_log,
+        bool was_npn_negotiated) = 0;
+  };
+
+  virtual ~HttpPipelinedConnection() {}
+
+  // Returns a new stream that uses this pipeline.
+  virtual HttpPipelinedStream* CreateNewStream() = 0;
+
+  // The number of streams currently associated with this pipeline.
+  virtual int depth() const = 0;
+
+  // True if this pipeline can accept new HTTP requests. False if a fatal error
+  // has occurred.
+  virtual bool usable() const = 0;
+
+  // True if this pipeline has bound one request and is ready for additional
+  // requests.
+  virtual bool active() const = 0;
+
+  // The SSLConfig used to establish this connection.
+  virtual const SSLConfig& used_ssl_config() const = 0;
+
+  // The ProxyInfo used to establish this connection.
+  virtual const ProxyInfo& used_proxy_info() const = 0;
+
+  // 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_