Draw 4x5 graph for grid options

Simplified the draw method

Screenshot: https://screenshot.googleplex.com/8hsf2bUJXM3osH3.png
Screenshot (high density): https://screenshot.googleplex.com/6A7fpV3ow5FWHdW.png
Screenshot (low density): https://screenshot.googleplex.com/AJDAgo5jWfDBgSe.png

Bug: 186606404
Test: manual, at different screen densities
Change-Id: Ibe4080be00d492028b1cb74ed1700498ad812196