[SPDY] Add flag and about:flags entry for SPDY/4 alpha 1

net/http/http_server_properties.cc

 // Copyright (c) 2012 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.
 
 #include "net/http/http_server_properties.h"
 
 #include "base/logging.h"
 #include "base/stringprintf.h"
 
 namespace net {
 
 const char kAlternateProtocolHeader[] = "Alternate-Protocol";
 // The order of these strings much match the order of the enum definition
 // for AlternateProtocol.
 const char* const kAlternateProtocolStrings[] = {
   "npn-spdy/1",
   "npn-spdy/2",
   "npn-spdy/3",
   "npn-spdy/3.1",
+  "npn-spdy/4a1",
   "quic"
 };
 const char kBrokenAlternateProtocol[] = "Broken";
 
 const char* AlternateProtocolToString(AlternateProtocol protocol) {
   switch (protocol) {
     case NPN_SPDY_1:
     case NPN_SPDY_2:
     case NPN_SPDY_3:
     case QUIC:
@@ skipping 19 matching lines @@
   return UNINITIALIZED_ALTERNATE_PROTOCOL;
 }
 
 
 std::string PortAlternateProtocolPair::ToString() const {
   return base::StringPrintf("%d:%s", port,
                             AlternateProtocolToString(protocol));
 }
 
 }  // namespace net