In crosswalk it is possible to use cordova plugins
And cordova inAppBrowser seems to work fine. But it still uses old android browser instead of crosswalk chromium (so doesn't support needed HTML5 features).
I can see this by checking user-agent for example:
1) inside the app:
Agent:Mozilla/5.0 (Linux; Android 4.2.2; PHONENAME) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Mobile Crosswalk/7.36.154.13 Mobile Safari/537.36 Response Headers
2) inside the inAppBrowser:
Mozilla/5.0 (Linux; U; Android 4.2.2; en-us; PHONENAME) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30