The Crosswalk build system produces two Android APK files: one for x86 CPU architecture devices and one for ARM CPU architecture devices. The build system combines these two APK files into a single ZIP file for easy download to your development system. After downloading this ZIP file, you must unzip it and extract the two APK files in order to publish them to an Android store.
The two APK files inside the ZIP will be named as follows:
YourAppName.android.crosswalk.x86.timestamp.apk
e.g.,CrosswalkExampleApp.android.crosswalk.x86.20140418132640.apkYourAppName.android.crosswalk.arm.timestamp.apk
e.g.,CrosswalkExampleApp.android.crosswalk.arm.20140418132745.apk
This Google Play Store* Submission Process document will walk you through the process to submit multiple APKs to the Google Play Store for distribution under a single application listing. By following this procedure you insure that your Crosswalk application is available to the widest consumer audience. The store will automatically provide the appropriate architecture file with no special intervention on the part of your customer.
If you want to learn more about this Google Play feature, which allows you to publish multiple APKs under a single application listing, please see Multiple APK Support on the Android Developer site.