When using command
Ionic browser add crosswalk
It install beta 13+ version of crosswalk. Crosswalk released stable 14+ branch. I changed xwalk.gradle from
def DEFAULT_VERSION = "org.xwalk:xwalk_core_library_beta:13+"
def DEFAULT_VERSION = "org.xwalk:xwalk_core_library:14+"
Seems it is working. Any one knows is there any particular reason for using beta:13+.