[linux/wayland] Improved the way the app ID is set for the window.

The window icon on Wayland is selected based on the app ID set for the
window, and then the icon is looked up in the relevant desktop entry.

For web apps, the app ID should be based on the extension ID and the
profile name.

Bug: 1145155
Change-Id: I5e895925448c7648205ceea27d3b6bccfa0c71a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3347575
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/main@{#955777}