Open Chrome's overflow menu (⋮) and tap Add to Home screen, then confirm the dialog.
On a device whose default launcher does not support
ShortcutManager.requestPinShortcut (and where WebAPK minting is
unavailable), Chrome reaches
WebappsUtils.addShortcutToHomescreen() →
sendBroadcast(INSTALL_SHORTCUT) with the MAC-bearing webapp
intent inside. The co-installed MacSniffer app captures it via a
runtime-registered receiver and logs EXTRA_URL /
EXTRA_MAC, then chains to WebappLauncherActivity.
Watch: adb logcat -s MacSniffer