Game Dashboard: Add logic to determine if a window is a game

Game Dashboard controller sets the ash::kIsGame window property if the
window is a game.

Bug: b:273640841
Test: Ran Ash unittests
Change-Id: I151092d892c0d6eb6a2e4d73f4b1c3b8749c06e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4425621
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Prameet Shah <phshah@chromium.org>
Auto-Submit: Prameet Shah <phshah@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Cici Ruan <cuicuiruan@google.com>
Commit-Queue: Cici Ruan <cuicuiruan@google.com>
Cr-Commit-Position: refs/heads/main@{#1136166}