In the Android app, add x-analytics request header with value pageview=1 for both RESTBase and MediaWiki php.api endpoints.
(Might as well add the missing preview=1 values to the link preview requests.)
In the analytics-refinery-source the PageviewDefinition for is isAppPageview() should be updated to use the pageview=1 value.
It would be great to get this completed and rolled out to the Android production app before we rollout RESTBase usage to the Android production app.