Added missing changes from previous commit

Author: konarshankar07

app/code/Magento/MediaGalleryApi/Api/Data/AssetInterface.php

@@ -65,6 +65,13 @@ public function getHeight(): int;
      */
     public function getWidth(): int;
 
+    /**
+     * Retrieve full licensed asset's width
+     *
+     * @return int
+     */
+    public function getSize(): int;
+
     /**
      * Get created at
      *