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

net/socket/ssl_client_socket.cc

Index: net/socket/ssl_client_socket.cc
diff --git a/net/socket/ssl_client_socket.cc b/net/socket/ssl_client_socket.cc
index 478ef18c7fb4e631558167c7770aa16eaa9efe76..371f790b6085050a7006b31f4d396df03995bf72 100644
--- a/net/socket/ssl_client_socket.cc
+++ b/net/socket/ssl_client_socket.cc
@@ -28,6 +28,8 @@ NextProto SSLClientSocket::NextProtoFromString(
     return kProtoSPDY3;
   } else if (proto_string == "spdy/3.1") {
     return kProtoSPDY31;
+  } else if (proto_string == "spdy/4a1") {
+    return kProtoSPDY4a1;
   } else {
     return kProtoUnknown;
   }
@@ -46,6 +48,8 @@ const char* SSLClientSocket::NextProtoToString(NextProto next_proto) {
       return "spdy/3";
     case kProtoSPDY31:
       return "spdy/3.1";
+    case kProtoSPDY4a1:
+      return "spdy/4a1";
     default:
       break;
   }