Added flow type

js/WebViewTypes.js

    */
   allowUniversalAccessFromFileURLs?: ?boolean,
 
+  /**
+   * Sets whether the webview allow access to file system.
+   * @platform android
+   */
+  allowFileAccess: ?boolean,
+
   /**
    * Used on Android only, controls whether form autocomplete data should be saved
    * @platform android