Re: [w3c/permissions] A new permission for canvas data (#165)

I vote agains't an API to inspect glyphs and get their parameters. I insist on that the existing fingerprinting vectors must be eliminated, including [measureText and getBoundingClientRectangle-based](https://github.com/KOLANICH/Article-2015-Dull-captaincy-or-the-way-Tor-Project-fights-browser-fingerprinting). For example it is possible try to make the text rendering identical on all the systems, shipping the fonts, maybe even a separate pack of fonts for each operation system targeted to compensate the differrences between rendering. Then you can decouple results of text-measuring API from the real results and just hope that they correspond. If they don't, c'est la vie, someone's rendering got a little broken.

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