Convert dt to a chrono::duration in drivetrain config

Change-Id: I8d44e181db3646330fa69ddd809cfff21fe236aa
diff --git a/y2017/control_loops/drivetrain/drivetrain_base.cc b/y2017/control_loops/drivetrain/drivetrain_base.cc
index b351cbf..ecea96c 100644
--- a/y2017/control_loops/drivetrain/drivetrain_base.cc
+++ b/y2017/control_loops/drivetrain/drivetrain_base.cc
@@ -1,15 +1,18 @@
 #include "y2017/control_loops/drivetrain/drivetrain_base.h"
 
-#include "frc971/control_loops/drivetrain/drivetrain_config.h"
+#include <chrono>
 
+#include "frc971/control_loops/drivetrain/drivetrain_config.h"
 #include "frc971/control_loops/state_feedback_loop.h"
-#include "y2017/control_loops/drivetrain/drivetrain_dog_motor_plant.h"
-#include "y2017/control_loops/drivetrain/polydrivetrain_dog_motor_plant.h"
-#include "y2017/control_loops/drivetrain/kalman_drivetrain_motor_plant.h"
 #include "y2017/constants.h"
+#include "y2017/control_loops/drivetrain/drivetrain_dog_motor_plant.h"
+#include "y2017/control_loops/drivetrain/kalman_drivetrain_motor_plant.h"
+#include "y2017/control_loops/drivetrain/polydrivetrain_dog_motor_plant.h"
 
 using ::frc971::control_loops::drivetrain::DrivetrainConfig;
 
+namespace chrono = ::std::chrono;
+
 namespace y2017 {
 namespace control_loops {
 namespace drivetrain {
@@ -29,7 +32,8 @@
       ::y2017::control_loops::drivetrain::MakeVelocityDrivetrainLoop,
       ::y2017::control_loops::drivetrain::MakeKFDrivetrainLoop,
 
-      drivetrain::kDt,
+      chrono::duration_cast<chrono::nanoseconds>(
+          chrono::duration<double>(drivetrain::kDt)),
       drivetrain::kRobotRadius,
       drivetrain::kWheelRadius,
       drivetrain::kV,