[Blimp Net] Add EngineAuthHandler.

blimp/common/create_blimp_message.cc

Index: blimp/common/create_blimp_message.cc
diff --git a/blimp/common/create_blimp_message.cc b/blimp/common/create_blimp_message.cc
index 4d331ac802caf174a2b749deb1bbbcc768127567..2b602c450a818c16c9cf183acaf935eae1504390 100644
--- a/blimp/common/create_blimp_message.cc
+++ b/blimp/common/create_blimp_message.cc
@@ -43,4 +43,18 @@ scoped_ptr<BlimpMessage> CreateBlimpMessage(
   return output;
 }
 
+scoped_ptr<BlimpMessage> CreateStartConnectionMessage(
+    const std::string& client_token,
+    int protocol_version) {
+  scoped_ptr<BlimpMessage> output(new BlimpMessage);

[Wez, 2015/12/08 22:59:59]

nit: I'd suggest putting using blank lines here to break this function into
three obvious logical blocks: 1. creating the BlimpMessage & setting the type,
2. creating the protocol control message & setting type and 3. creating the
start-connection message within it.

[haibinlu, 2015/12/09 00:02:33]

Done.

+  output->set_type(BlimpMessage::PROTOCOL_CONTROL);
+  ProtocolControlMessage* control_message = output->mutable_protocol_control();
+  control_message->set_type(ProtocolControlMessage::START_CONNECTION);
+  StartConnectionMessage* start_connection_message =
+      control_message->mutable_start_connection();
+  start_connection_message->set_client_token(client_token);
+  start_connection_message->set_protocol_version(protocol_version);
+  return output;
+}
+
 }  // namespace blimp