Use the drivetrain position from when the frame was captured

Change-Id: I30055d13a3dc88497985f484f4e1d08ae1ef592f
diff --git a/y2016/vision/vision.q b/y2016/vision/vision.q
index d762d17..a0d021c 100644
--- a/y2016/vision/vision.q
+++ b/y2016/vision/vision.q
@@ -23,5 +23,12 @@
 
   // Capture time of the angle using the clock behind Time::Now().
   int64_t target_time;
+
+  // The estimated positions of both sides of the drivetrain when the frame
+  // was captured.
+  // These are the estimated_left_position and estimated_right_position members
+  // of the drivetrain queue.
+  double drivetrain_left_position;
+  double drivetrain_right_position;
 };
 queue VisionStatus vision_status;