GitLab

- Add js_modulizer and polymer_modulizer rules to autogenerate Polymer 3
  versions of most files in controls/ and their dependencies.
- Note: settings_idle_load is excluded, as it may not be feasible
  to autogenerate (may need to check in a manually created P3 version).
- Add closure compilation targets for the Polymer 3 files.
- Autogenerate P3 versions of browser_tests for the elements that have
  browser_tests currently.

Bug: 1026426
Change-Id: I55d77c0432fb81df5e6976987685477d2bbc0cc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024283
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736924}