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Change the bookmarks Web UI build to be more similar to other Web UI
pages (e.g. extensions, settings, Print Preview) by adding individual
grd files for its resources, and building the optimized page from
an unpak folder.

This will allow the page to leverage existing logic in unpack_pak to
place generated Polymer 3 JS files and non-generated JS module files
in the same folder structure for bundling when the page is migrated
to Polymer 3.

Bug: 1022213
Change-Id: If27d96cefbca79f7b4b238b5123482dab465b4c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904450Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713921}