This change also syncs the drawables with Master.
Cherry-pick: I2573786aac5fd8d543cf12d24c951b67c7353fd7
Bug: 4436327
Change-Id: I88dc0162033a1017040205590c0c34a5111b835a
This change adds lightweight visual hints of alternate numeric characters on the top row - e.g. having a light gray '1' on the upper right corner of letter 'q'
Note that MDPI resources are tentative (the same as HDPI for now, until we get fixed MDPI visual assets).
bug: 3004632
Change-Id: I7a25cf90b702433a844c88f5c47bf914706af9bc