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Add input_files and input_files_base_dir arguments for generate_grd, to
allow inclusion of files that are not preprocessed and therefore
included in the manifest in the grd file. Additional updates to
generate_grd:
- Rename rollup files that aren't shared.rollup.js
- Set file type in the grd as "chrome_html" for HTML/JS files
- Adding tests

Started from:
https://chromium-review.googlesource.com/c/chromium/src/+/2443211
by dpapad@

Also removing some unnecessary kGeneratedPath constants from various
Web UI controllers that have been updated to use autogenerated grd
files. These autogenerated files contain resource_path properties for
each <include>, so stripping the generated portion of the path in
webui_util.cc is no longer necessary.

Bug: 1132403
Change-Id: Ia707d48fe348b168dce6bf806099ffd209385bed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463333
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815746}