Please, add to App Preview Native Web View mode for testing some features that may doesn't work without CrossWalk.
If I run my app in App Preview, almost functionality works well. But when I build my app with native without CrossWalk, more my functions doesn't work.
Elias -- the current version of App Preview (2.7 and 2.8) does use the native webview, it does not use the Crosswalk webview. The Debug tab does use the Crosswalk webview. If you are running App Preview on an Android 5+ device the webview is based on a very modern version of Chrome, and will have features similar to the Crosswalk webview. The Android 4.4 devices use an old Chromium webview. Android 4.3 and below use the original Android webview, which is very difficult to use. See this blog for some useful links > http://blogs.intel.com/evangelists/2015/05/12/build-high-performance-html5-cordova-apps-with-crosswa....
So if you are using an Android 4.4 or higher device with App Preview, especially an Android 5+ device, you are seeing a fairly good webview. To test on a "bad" webview get an Android 4.3 or older device. Even Android 4.4 devices have problems (they are based on ~Chrome 30).