There is a known issue with the build system that results in no naming of the two Crosswalk builds that you get from the build system when building an embedded Crosswalk APK (see https://software.intel.com/en-us/xdk/docs/using-the-crosswalk-for-androi... and https://software.intel.com/en-us/xdk/docs/submitting-multiple-crosswalk-... for more information).
There are two ways to determine which APK is the ARM and which is the x86 build:
- the larger APK is the x86 image
- the "lib" directory inside the APK will indicate the target architecture
See the image, below, for an example of the second bullet, above.