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NTP also adds its own custom grit define that is separate from the
standard chrome grit defines, so modify preprocess_grit.gni to allow
passing extra grit defines to preprocess_grit.

This also enables the possibility of copying some mojo files to the
new preprocessed folder for  bundling in future (planned for a
followup).

Bug: 1128583
Change-Id: Iaa42fe3dab695c77c75f413e9b7a7a6fddb7cbdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430584
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814104}