In the Japanese locale, add the following fonts to the Universal Language Selector's Web Fonts feature.
Font Name: Noto Serif Hentaigana
Version: v1.000
Download Site URL: https://github.com/notofonts/hentaigana
Bug: T347520
Change-Id: I70d9bab18c138ea786df1aaf2394450f1f7044ea