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Also create a new print_preview_vars_css.html file, to store all CSS
variables separately from common styles.

Bug: 952960, 941369
Change-Id: I24bcc3cca781d7acfe7ff075e5b954827b009745
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573163
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652666}