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Resources used need to be pre-declared in the shell.

Since we don't know how many shortcuts are needed for a web app until
the creation request, we create 4 copies of the needed resources to
declare a shortcut, since that is the maximum number of shortcuts
allowed on Android.

The following resources are needed (per shortcut):
- name
- short_name
- icon (placeholder taken from
    https://material.io/resources/icons/?icon=filter_1&style=baseline)

The shortcuts.xml is also partially generated to use the resources, so
that building the shell apk doesn't fail. They are all disabled by
default, and will need to be re-enabled on the server-side.

Bug: 1010471
Change-Id: I5371b145afd943029de8eb679b0cf3044545cbe3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875755Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Glenn Hartmann <hartmanng@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709189}