Display openpilot logics for following lead vehicles

Added toggle to show openpilot's logic in regards to following lead vehicles.

selfdrive/ui/qt/onroad.h

@@ -40,7 +40,7 @@ class ExperimentalButton : public QPushButton {
 
 public:
   explicit ExperimentalButton(QWidget *parent = 0);
-  void updateState(const UIState &s);
+  void updateState(const UIState &s, bool leadInfo);
 
 private:
   void paintEvent(QPaintEvent *event) override;
@@ -54,6 +54,8 @@ private:
 
   // FrogPilot variables
   UIScene &scene;
+
+  int y_offset;
 };
 
 
@@ -109,6 +111,7 @@ private:
   void initializeFrogPilotWidgets();
   void updateFrogPilotWidgets(QPainter &p);
 
+  void drawLeadInfo(QPainter &p);
   void drawStatusBar(QPainter &p);
   void drawTurnSignals(QPainter &p);
 
@@ -125,18 +128,27 @@ private:
   bool blindSpotRight;
   bool conditionalExperimental;
   bool experimentalMode;
+  bool leadInfo;
   bool mapOpen;
   bool turnSignalLeft;
   bool turnSignalRight;
 
+  float distanceConversion;
+  float speedConversion;
+
   int cameraView;
   int conditionalSpeed;
   int conditionalSpeedLead;
   int conditionalStatus;
   int customColors;
   int customSignals;
+  int obstacleDistance;
+  int obstacleDistanceStock;
   int totalFrames = 8;
 
+  QString leadDistanceUnit;
+  QString leadSpeedUnit;
+
   size_t animationFrameIndex;
 
   std::unordered_map<int, std::tuple<QString, int, QColor, std::map<double, QBrush>>> themeConfiguration;