Squashed 'third_party/allwpilib_2016/' content from commit 7f61816

Change-Id: If9d9245880859cdf580f5d7f77045135d0521ce7
git-subtree-dir: third_party/allwpilib_2016
git-subtree-split: 7f618166ed253a24629934fcf89c3decb0528a3b
diff --git a/wpilibc/shared/src/interfaces/Potentiometer.cpp b/wpilibc/shared/src/interfaces/Potentiometer.cpp
new file mode 100644
index 0000000..3856090
--- /dev/null
+++ b/wpilibc/shared/src/interfaces/Potentiometer.cpp
@@ -0,0 +1,15 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2015. 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 $(WIND_BASE)/WPILib.  */
+/*----------------------------------------------------------------------------*/
+
+#include <interfaces/Potentiometer.h>
+#include <Utility.h>
+
+void Potentiometer::SetPIDSourceType(PIDSourceType pidSource) {
+  if (wpi_assert(pidSource == PIDSourceType::kDisplacement)) {
+    m_pidSource = pidSource;
+  }
+}