[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..742bbfe8f9fdf52adabb7eaf4f15c7df7b2bfe1c 100644
--- a/blimp/common/create_blimp_message.cc
+++ b/blimp/common/create_blimp_message.cc
@@ -43,4 +43,15 @@ scoped_ptr<BlimpMessage> CreateBlimpMessage(
   return output;
 }
 
+scoped_ptr<BlimpMessage> CreateBlimpMessage(
+    StartConnectionMessage** start_connection_message) {
+  DCHECK(start_connection_message);
+  scoped_ptr<BlimpMessage> output(new BlimpMessage);
+  output->set_type(BlimpMessage::PROTOCOL_CONTROL);
+  ProtocolControlMessage* control_message = output->mutable_protocol_control();
+  control_message->set_type(ProtocolControlMessage::START_CONNECTION);
+  *start_connection_message = control_message->mutable_start_connection();
+  return output;
+}
+
 }  // namespace blimp