gd: Add Additional PWA Support

Enables an additional set of PWA games behind a new "Game Dashboard
Game PWAs" flag.

the flag is enabled

Bug: b:342480713
Test: Manually verified the Game Dashboard shows on the added PWAs when
Demo: http://b/342480713#comment2
Change-Id: I9b63bd2b4942da0031e31db4d673458f1f534269
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5569633


Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Emilia Paz <emiliapaz@chromium.org>
Commit-Queue: Gina Domergue <gdomergue@google.com>
Reviewed-by: Prameet Shah <phshah@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313062}