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

blimp/common/create_blimp_message.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/common/create_blimp_message.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "blimp/common/proto/blimp_message.pb.h"
@@ skipping 48 matching lines @@
 std::unique_ptr<BlimpMessage> CreateBlimpMessage(
     RenderWidgetMessage** render_widget_message,
     int target_tab_id) {
   std::unique_ptr<BlimpMessage> output(new BlimpMessage);
   output->set_target_tab_id(target_tab_id);
   *render_widget_message = output->mutable_render_widget();
   return output;
 }
 
 std::unique_ptr<BlimpMessage> CreateBlimpMessage(SizeMessage** size_message) {
-  DCHECK(size_message);
   TabControlMessage* control_message;
   std::unique_ptr<BlimpMessage> output = CreateBlimpMessage(&control_message);
   control_message->mutable_size();
   *size_message = control_message->mutable_size();
   return output;
 }
 
 std::unique_ptr<BlimpMessage> CreateBlimpMessage(
     EngineSettingsMessage** engine_settings) {
   std::unique_ptr<BlimpMessage> output(new BlimpMessage);
@@ skipping 22 matching lines @@
   start_connection_message->set_protocol_version(protocol_version);
 
   return output;
 }
 
 std::unique_ptr<BlimpMessage> CreateCheckpointAckMessage(
     int64_t checkpoint_id) {
   std::unique_ptr<BlimpMessage> output(new BlimpMessage);
 
   ProtocolControlMessage* control_message = output->mutable_protocol_control();
-  control_message->mutable_checkpoint_ack();
-
   CheckpointAckMessage* checkpoint_ack_message =
       control_message->mutable_checkpoint_ack();
   checkpoint_ack_message->set_checkpoint_id(checkpoint_id);
 
   return output;
 }
 
+std::unique_ptr<BlimpMessage> CreateEndConnectionMessage(
+    EndConnectionMessage::Reason reason) {
+  std::unique_ptr<BlimpMessage> output(new BlimpMessage);
+
+  ProtocolControlMessage* control_message = output->mutable_protocol_control();
+  EndConnectionMessage* end_connection_message =
+      control_message->mutable_end_connection();
+  end_connection_message->set_reason(reason);
+
+  return output;
+}
+
 }  // namespace blimp