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Preparation for bundling the PDF Viewer's resources, step 1/3.

Specifically register Print Preview PDF resources as part of
c/b/r/print_preview:build_grd to decouple from PDF Viewer's build.

In the future, Print Preview's PDF resources can be bundled in
print_preview.rollup.js, if deemed beneficial.

Bug: 1163956
Change-Id: I8beeaa27f815ac4c1dc481bbd075a4a7e4865b05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625274
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842736}