Use Chromium BUILD to approximate Blimp protocol version, and check it.

blimp/net/client_connection_manager.cc

 // Copyright 2015 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 "blimp/net/client_connection_manager.h"
 
 #include "base/logging.h"
 #include "blimp/common/create_blimp_message.h"
 #include "blimp/common/proto/blimp_message.pb.h"
-#include "blimp/common/protocol_version.h"
+#include "blimp/common/version_info.h"
 #include "blimp/net/blimp_connection.h"
 #include "blimp/net/blimp_message_processor.h"
 #include "blimp/net/blimp_transport.h"
 #include "blimp/net/browser_connection_handler.h"
 #include "blimp/net/connection_handler.h"
 #include "net/base/net_errors.h"
 
 namespace blimp {
 
 ClientConnectionManager::ClientConnectionManager(
@@ skipping 40 matching lines @@
     DVLOG(1) << "Transport " << transport->GetName()
              << " failed to connect:" << net::ErrorToString(result);
     Connect(transport_index + 1);
   }
 }
 
 void ClientConnectionManager::SendAuthenticationMessage(
     std::unique_ptr<BlimpConnection> connection) {
   DVLOG(1) << "Sending authentication message.";
   connection->GetOutgoingMessageProcessor()->ProcessMessage(
-      CreateStartConnectionMessage(client_token_, kProtocolVersion),
+      CreateStartConnectionMessage(client_token_, GetProtocolVersion()),
       base::Bind(&ClientConnectionManager::OnAuthenticationMessageSent,
                  weak_factory_.GetWeakPtr(),
                  base::Passed(std::move(connection))));
 }
 
 void ClientConnectionManager::OnAuthenticationMessageSent(
     std::unique_ptr<BlimpConnection> connection,
     int result) {
   DVLOG(1) << "AuthenticationMessageSent, result=" << result;
   if (result != net::OK) {
     // If a write error occurred, just throw away |connection|.
     // We don't need to propagate the error code here because the connection
     // will already have done so via the ErrorObserver object.
     return;
   }
   connection_handler_->HandleConnection(std::move(connection));
 }
 
 void ClientConnectionManager::OnConnectionError(int error) {
   // TODO(kmarshall): Replace this with actual reconnection logic.
   VLOG(0) << "Connection dropped, error=" << error;
   Connect();
 }
 
 }  // namespace blimp