Add request-url field for KhmerOSbattambang font.

Added the git and gerrit commit URLs for the addition of the KhmerOSbattambang font for
Khmer (km) language.

Change-Id: I324c683efcfe2f90b5c6ae7636e4dc61f8b26a5b
Merge "Add request-url field for KhmerOSbattambang font."