Add fluent builders for more flexibly adding data to Shuffleboard (#1022)

wpilibc/src/main/native/include/frc/shuffleboard/ShuffleboardRoot.h

@@ -0,0 +1,50 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#pragma once
+
+#include <wpi/StringRef.h>
+
+namespace frc {
+
+class ShuffleboardTab;
+
+/**
+ * The root of the data placed in Shuffleboard. It contains the tabs, but no
+ * data is placed directly in the root.
+ *
+ * This class is package-private to minimize API surface area.
+ */
+class ShuffleboardRoot {
+ public:
+  /**
+   * Gets the tab with the given title, creating it if it does not already
+   * exist.
+   *
+   * @param title the title of the tab
+   * @return the tab with the given title
+   */
+  virtual ShuffleboardTab& GetTab(wpi::StringRef title) = 0;
+
+  /**
+   * Updates all tabs.
+   */
+  virtual void Update() = 0;
+
+  /**
+   * Enables all widgets in Shuffleboard that offer user control over actuators.
+   */
+  virtual void EnableActuatorWidgets() = 0;
+
+  /**
+   * Disables all widgets in Shuffleboard that offer user control over
+   * actuators.
+   */
+  virtual void DisableActuatorWidgets() = 0;
+};
+
+}  // namespace frc