GitLab

 - Add new resource_path_prefix option to generate_grd(), which
   makes it possible to generate grdp files in subfolders of the
   parent grd file.
 - Move preprocess_grit() for cr_elements/ under cr_elements/BUILD.gn
 - Add new generate_grd() target in cr_elements/
 - Remove now obsolete alias in shared_resources_data_source.cc.

Bug: 1132403
Change-Id: Ia1920b2eb799bcce325bf0087c9f3450b153b816
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494781
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821183}