SPDY - add support for spdy/2.1 to support flow control.

net/http/http_server_properties.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_SERVER_PROPERTIES_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_H_
 
 #include <map>
 #include <string>
 #include "base/basictypes.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_export.h"
 #include "net/http/http_pipelined_host_capability.h"
 #include "net/spdy/spdy_framer.h"  // TODO(willchan): Reconsider this.
 
 namespace net {
 
 enum AlternateProtocol {
   NPN_SPDY_1 = 0,
   NPN_SPDY_2,
+  NPN_SPDY_21,
   NUM_ALTERNATE_PROTOCOLS,
   ALTERNATE_PROTOCOL_BROKEN,  // The alternate protocol is known to be broken.
   UNINITIALIZED_ALTERNATE_PROTOCOL,
 };
 
 struct NET_EXPORT PortAlternateProtocolPair {
   bool Equals(const PortAlternateProtocolPair& other) const {
     return port == other.port && protocol == other.protocol;
   }
 
@@ skipping 78 matching lines @@
 
   virtual PipelineCapabilityMap GetPipelineCapabilityMap() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HttpServerProperties);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_H_