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Specifically, adding new test suites webui_polymer2_browser_tests and
webui_polymer2_interactive_ui_tests that run a given list of tests and
explicitly excludes currently failing tests.

This will allow gradually getting to a state where all tests are passing
with the flag on.

Bug: 862472
Change-Id: Ia19ae36a4b2b63499b970e14c742b7719e118f83
Reviewed-on: https://chromium-review.googlesource.com/1132320
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583049}