Not sure, you'll have to give it a try. If you inspect the navigator.userAgent string in your Crosswalk app you can see which version of Chromium the specific version of Crosswalk you are using is based on. From that you can determine which HTML5 features are likely to be present, since the rendering engine inside of Crosswalk is based directly on the Chromium project. Different versions of Crosswalk include different versions of Chromium, so you can decide which is the right version for your needs.
Crosswalk for Android has nothing to do with Tizen. In the userAgent string you'll get a Crosswalk version number that looks like this:
The first number (21 in this example) is the version of Crosswalk.
The second number (51 in this example) is the version of Chromium (which is a core component in Chrome).
That second number is what you have to use to determine the features you want to use, or use something like https://html5test.com/ in a sample app to see if the feature you're looking for is present.
If you are referring to this > https://developer.android.com/reference/android/view/ContextMenu.html < then you need to search the web for something like "access to android ContextMenu in cordova app" or similar.