Add chromium-snap-pwa.patch.

Nathan Teodosiorequested to merge
nteodosio/gnome-shell:pwa into ubuntu/latest

Fixes tab and dock grouping of progressive web applications for the Chromium snap (LP: #2007652).

PPA: https://launchpad.net/~nteodosio/+archive/ubuntu/pwa/

Edited by Nathan Teodosio

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