Re: [w3c/manifest] feat: add support for adaptive icons (#563)

Hi Ken,

This has become somewhat urgent since Chrome 69 seems to be upgrading to the Android O SDK and suddenly all the web app icons are going inside white circles (https://crbug.com/862041). It would be good if we can let web apps specify Adaptive icons soon.

Do you think we can start with _just_ the masking (not parallax) so the proposal basically just becomes:

- Introduce a new `"purpose": "maskable"` type of icon.
- Give it semantics of: not supposed to have an alpha channel; define a "safe zone" (such as a circle of some radius around the center) of pixels that *must* be shown, and say that the user agent may mask off any other pixels outside of the safe zone.
- Optional; a non-maskable icon is still mandatory. And it's completely optional for user agents to use the maskable icons.

No foreground/background. No "dead zone". Should be fairly straightforward. I think we can commit to implementing this in Chrome.

Do you have time to work on this proposal? Otherwise, I can draft one up.

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