Make monotonic_now a required parameter to PhasedLoop

This prepares us much better for mocking out time as part of the event
loop conversion.

Change-Id: I57560b97b265ddd41fe7a4e9f74d7b1324d15955
diff --git a/y2016/dashboard/dashboard.h b/y2016/dashboard/dashboard.h
index 2e01f40..58c9890 100644
--- a/y2016/dashboard/dashboard.h
+++ b/y2016/dashboard/dashboard.h
@@ -65,6 +65,8 @@
     ::std::vector<ItemDatapoint> datapoints;
   };
 
+  ::aos::EventLoop *event_loop_;
+
   ::aos::Fetcher<::y2016::vision::VisionStatus> vision_status_fetcher_;
   ::aos::Fetcher<::y2016::sensors::BallDetector> ball_detector_fetcher_;
   ::aos::Fetcher<::frc971::autonomous::AutonomousMode> autonomous_mode_fetcher_;