Move PDP values out to a separate queue so the timestamps make sense etc

Change-Id: Iad5303c3446dc29f339f02af9c9c99dd7c75d8e0
diff --git a/y2015/wpilib/wpilib_interface.cc b/y2015/wpilib/wpilib_interface.cc
index e70c92f..c2250bb 100644
--- a/y2015/wpilib/wpilib_interface.cc
+++ b/y2015/wpilib/wpilib_interface.cc
@@ -126,8 +126,7 @@
 
 class SensorReader {
  public:
-  SensorReader(::frc971::wpilib::PDPFetcher *pdp_fetcher)
-      : pdp_fetcher_(pdp_fetcher) {
+  SensorReader() {
     // Set it to filter out anything shorter than 1/4 of the minimum pulse width
     // we should ever see.
     filter_.SetPeriodNanoSeconds(
@@ -260,7 +259,7 @@
   }
 
   void RunIteration() {
-    ::frc971::wpilib::SendRobotState(my_pid_, ds_, pdp_fetcher_);
+    ::frc971::wpilib::SendRobotState(my_pid_, ds_);
 
     {
       auto drivetrain_message = drivetrain_queue.position.MakeMessage();
@@ -314,7 +313,6 @@
  private:
   int32_t my_pid_;
   DriverStation *ds_;
-  ::frc971::wpilib::PDPFetcher *const pdp_fetcher_;
 
   void CopyPotAndIndexPosition(
       const DMAEncoderAndPotentiometer &encoder, PotAndIndexPosition *position,
@@ -663,7 +661,7 @@
     ::frc971::wpilib::PDPFetcher pdp_fetcher;
     ::std::thread pdp_fetcher_thread(::std::ref(pdp_fetcher));
 
-    SensorReader reader(&pdp_fetcher);
+    SensorReader reader;
     reader.set_arm_left_encoder(encoder(1));
     reader.set_arm_left_index(make_unique<DigitalInput>(1));
     reader.set_arm_left_potentiometer(make_unique<AnalogInput>(1));