GitLab

This is in preparation of using optimizing with polymer-bundler. 

Bug: 764126
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I96a88dff699389366122d39344044023d5b20b3c
Reviewed-on: https://chromium-review.googlesource.com/699245Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506921}