tree c1e649aa207bf7f10e3af6952207c82d2c84ec5d
parent 06b37658dccb0320ccff8262f7ebc181bf393082
author Urvang Joshi <urvang@google.com> 1541460382 -0800
committer Urvang Joshi <urvang@google.com> 1541556304 -0800

Reference related code: Better naming and comments

Rename ref_fb_idx to remapped_ref_idx

Also, add comments for:
- remapped_ref_idx
- ref_frame_map
- new_fb_idx
- frame_refs

Finally, remove unused variable refresh_fb_idx

BUG=aomedia:2230

Change-Id: I3e2f94e1ab0cb112a47e828f2d88656cbd37b532