Add riptiding API

src/main/java/org/bukkit/entity/LivingEntity.java

@@ -516,6 +516,23 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
      */
     public boolean isRiptiding();
 
+    /**
+     * Makes entity start or stop riptiding.
+     * Note: This does not damage living entities.
+     *
+     * @param riptiding whether the entity should start riptiding.
+     * @see #startRiptideAttack(int, float, ItemStack)
+     */
+    public void setRiptiding(boolean riptiding);
+
+    /**
+     * Makes the entity use their current item to start a riptide attack.
+     * @param duration attack duration in ticks.
+     * @param attackStrength attack strength
+     * @param attackItem item used to attack.
+     */
+    public void startRiptideAttack(int duration, float attackStrength, @Nullable ItemStack attackItem);
+
     /**
      * Returns whether this entity is slumbering.
      *