Install

Just some notes at this point - somewhat wondering around in the dark (on an HTC One X) :

host$ adb shell 'mkdir sdcard/developer'
host$ adb push build/app /sdcard/developer/calculator

now to get the xwalk binary on there…assuming the zip was downloaded to ~/Downloads
host$ cd ~/Downloads
host$ mkdir xwalk; cd xwalk
host$ unzip ../xwalk-android.zip
host$ adb shell ‘pm set-install-location 2’
host]$ adb install xwalk-android/apks/XWalkCoreShell.apk
629 KB/s (18634788 bytes in 28.899s)
	pkg: /data/local/tmp/XWalkCoreShell.apk
Success

Then go to the application list and locate the 'XWalkCoreShell' app, and type in file:///sdcard/developer/calculator/index.html into the URL field at the top.