ANDROID_ID for Instant Apps now has the following properties:
1) per-app scoped
2) reset if the user clears the Instant App
3) remains the same if the Instant App gets upgraded to an installed
app.
Note that if the user goes instant -> installed_1 -> uninstall ->
installed_2 the ANDROID_ID at installed_1 will not be the same as
installed_2. This was deemed better than the id changing on the upgrade
step.
Test: manual
Change-Id: I532975c50049c94ff80902a897e001dd35a69f9f
0d277a7b18