GitLab

When autogenerating Polymer 3 JS files, add
<!--_html_template_start_--> to the beginning of the template and
<!--_html_template_end_--> to the end.

This will be used to identify HTML start and end locations for
performing i18n replacements in a followup CL. Adding the tags allows
the replacement code to search for only one set of markers, instead of
needing to handle multiple syntaxes.

Bug: 1023841
Change-Id: Ie70638095f5a0bf631028052ab5f2165ccc41ade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935038Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718932}