GitLab

Add tags to all pages in each page set to enable filtering results by different page
sets.

Bug: 849392
Change-Id: Icf6a97566925de783b81cf2f4cb71f3d68f11971
Reviewed-on: https://chromium-review.googlesource.com/1093012
Commit-Queue: Amy Qiu <amyqiu@google.com>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567659}