Added BuiltInAccelerometer in Java and updated C++

Change-Id: I5a3360c51334e85da6a15fd640f9420bc3b64dca

wpilibj/wpilibJavaJNI/lib/AccelerometerJNI.cpp

@@ -0,0 +1,58 @@
+#include <jni.h>
+#include "edu_wpi_first_wpilibj_hal_AccelerometerJNI.h"
+#include "HAL/Accelerometer.hpp"
+
+/*
+ * Class:     edu_wpi_first_wpilibj_hal_AccelerometerJNI
+ * Method:    setAccelerometerActive
+ * Signature: (Z)V
+ */
+JNIEXPORT void JNICALL Java_edu_wpi_first_wpilibj_hal_AccelerometerJNI_setAccelerometerActive
+  (JNIEnv *, jclass, jboolean active)
+{
+	setAccelerometerActive(active);
+}
+
+/*
+ * Class:     edu_wpi_first_wpilibj_hal_AccelerometerJNI
+ * Method:    setAccelerometerRange
+ * Signature: (I)V
+ */
+JNIEXPORT void JNICALL Java_edu_wpi_first_wpilibj_hal_AccelerometerJNI_setAccelerometerRange
+  (JNIEnv *, jclass, jint range)
+{
+	setAccelerometerRange((AccelerometerRange)range);
+}
+
+/*
+ * Class:     edu_wpi_first_wpilibj_hal_AccelerometerJNI
+ * Method:    getAccelerometerX
+ * Signature: ()D
+ */
+JNIEXPORT jdouble JNICALL Java_edu_wpi_first_wpilibj_hal_AccelerometerJNI_getAccelerometerX
+  (JNIEnv *, jclass)
+{
+	return getAccelerometerX();
+}
+
+/*
+ * Class:     edu_wpi_first_wpilibj_hal_AccelerometerJNI
+ * Method:    getAccelerometerY
+ * Signature: ()D
+ */
+JNIEXPORT jdouble JNICALL Java_edu_wpi_first_wpilibj_hal_AccelerometerJNI_getAccelerometerY
+  (JNIEnv *, jclass)
+{
+	return getAccelerometerY();
+}
+
+/*
+ * Class:     edu_wpi_first_wpilibj_hal_AccelerometerJNI
+ * Method:    getAccelerometerZ
+ * Signature: ()D
+ */
+JNIEXPORT jdouble JNICALL Java_edu_wpi_first_wpilibj_hal_AccelerometerJNI_getAccelerometerZ
+  (JNIEnv *, jclass)
+{
+	return getAccelerometerZ();
+}