[w3c/manifest] Add a 'masking' purpose, for allowing the UA to supercompose such icons (#657)

Follow Matt's idea and just allow icons to be masked for now.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/657

-- Commit Summary --

  * Add a 'masking' purpose, for allowing the UA to supercompose such icons

-- File Changes --

    M index.html (57)

-- Patch Links --

https://github.com/w3c/manifest/pull/657.patch
https://github.com/w3c/manifest/pull/657.diff

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https://github.com/w3c/manifest/pull/657