Not working well with generated source from another processor

Try to use this plugin in my android project where I also use [Glide image library](https://github.com/bumptech/glide).

Glide generates Java source (GlideApp) dynamically which is used in app, however plugin is unable to find that as source, if i don't use checker app complies normally

`
/Users/xxx/work/code/app/src/main/java/com/yyy/MainActivity.java:113: error: cannot find symbol
import com.yyy.GlideApp;
^
symbol: class GlideApp
location: package com.yyy
`

Am I missing something?

Reproduce the failure in an Android project using the Gradle Checker Framework plugin and Glide, starting from the MainActivity.java import error for generated GlideApp. Trace how the plugin handles generated Java sources while checking, and verify that the project compiles with the checker enabled and GlideApp available.

Written by the indexing model from the issue text.