[android] - add LatLng for pixel conversion feature to MapSnapshotter

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/snapshotter/MapSnapshot.java

@@ -42,6 +42,14 @@ public class MapSnapshot {
    */
   public native PointF pixelForLatLng(LatLng latLng);
 
+  /**
+   * Calculate geographical coordinates from a point in pixels on the Image
+   *
+   * @param pointF the point in pixels
+   * @return the geographical coordinates
+   */
+  public native LatLng latLngForPixel(PointF pointF);
+
   /**
    * @return The attributions for the sources of this snapshot.
    */