GitLab

Update roll-script to DEPS in the package instead of checking it
in. The new package folder lives at a new place to ensure there
are no issues when rolling back or forward from this CL. The new
location is:
//third_party/dom_distiller_js/dist.

After running `ant package`, the roll-script now takes the content
from out/package and pushes it to an external repository on
GitHub (chromium/dom-distiller-dist) and updates DEPS for
that repo to refer to the newly pushed version.

BUG=467787

Review URL: https://codereview.chromium.org/987793002

Cr-Commit-Position: refs/heads/master@{#321576}