Add 'chws' feature support to CJK fonts

This feature is not enabled by default on Android, thus no
visual impact is expected now. Chrome will use this feature by
default and future Android may use this feature by default.

The 'chws' feature spec:
https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#tag-chws

The font file is created by kojii@google.com with
https://github.com/kojiishi/contextual-spacing

Bug: N/A
Test: Locally verified that there is no glyph diff by ttx dump.
Change-Id: Ie3ed803eb66cf2a46299dfd15522f87af63fe705
3 files changed