[core] Support fill-extrusion-vertical-gradient

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/FillExtrusionLayer.java

@@ -370,6 +370,18 @@ public class FillExtrusionLayer extends Layer {
     nativeSetFillExtrusionBaseTransition(options.getDuration(), options.getDelay());
   }
 
+  /**
+   * Get the FillExtrusionVerticalGradient property
+   *
+   * @return property wrapper value around Boolean
+   */
+  @NonNull
+  @SuppressWarnings("unchecked")
+  public PropertyValue<Boolean> getFillExtrusionVerticalGradient() {
+    checkThread();
+    return (PropertyValue<Boolean>) new PropertyValue("fill-extrusion-vertical-gradient", nativeGetFillExtrusionVerticalGradient());
+  }
+
   @NonNull
   @Keep
   private native Object nativeGetFillExtrusionOpacity();
@@ -440,6 +452,10 @@ public class FillExtrusionLayer extends Layer {
   @Keep
   private native void nativeSetFillExtrusionBaseTransition(long duration, long delay);
 
+  @NonNull
+  @Keep
+  private native Object nativeGetFillExtrusionVerticalGradient();
+
   @Override
   @Keep
   protected native void finalize() throws Throwable;

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/PropertyFactory.java

@@ -1244,6 +1244,26 @@ public class PropertyFactory {
     return new PaintPropertyValue<>("fill-extrusion-base", expression);
   }
 
+  /**
+   * Whether to apply a vertical gradient to the sides of a fill-extrusion layer. If true, sides will be shaded slightly darker farther down.
+   *
+   * @param value a Boolean value
+   * @return property wrapper around Boolean
+   */
+  public static PropertyValue<Boolean> fillExtrusionVerticalGradient(Boolean value) {
+    return new PaintPropertyValue<>("fill-extrusion-vertical-gradient", value);
+  }
+
+  /**
+   * Whether to apply a vertical gradient to the sides of a fill-extrusion layer. If true, sides will be shaded slightly darker farther down.
+   *
+   * @param expression an expression statement
+   * @return property wrapper around an expression statement
+   */
+  public static PropertyValue<Expression> fillExtrusionVerticalGradient(Expression expression) {
+    return new PaintPropertyValue<>("fill-extrusion-vertical-gradient", expression);
+  }
+
   /**
    * The opacity at which the image will be drawn.
    *