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Instead of inlining 3 different test suites in a single TEST_F, split
these test suites into separate files and run them as 3 different
tests.

This is in preparation for migrating bookmarks to Polymer 3, since the
main test file cannot be a module script, but the file(s) containing the
tests themselves will need to be module scripts in order to import from
the Polymer 3/modularized code.

Note: All these tests are currently disabled, but ran them locally
successfully on Linux (with optimize_webui =  true and false).

Bug: 1022213
Change-Id: Id388411fd9b7a58c058cd49260f6fbe9036201c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915620Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715355}