can't find mapping of "android.permission.INTERNET" permission to famous methods which should use it
The readme states:


  Maps are currently missing APIs with permissions checked in native code (Camera, etc.). We hope to provide these soon.


The permission android.permission.INTERNET is a permission that is mostly checked on native code level. Therefore you won't find much references to it in the API mapping files.

Update: The old mapping files that did include APIs for the Internet permission were as far as I know generated by manually reviewing the AOSP source code for permission checks. Over the time AOSP got larger and larger and the release frequency increased therefore this toot too much effort for providing those info for each and every Android release. Therefore the people who created the mapping files concentrated on the Java part which is much smaller and easier to check.