GitLab

* Follow up to comments from https://crrev.com/c/767663
* Also limit archived_binaries from DMGs
* Add metrics so we can see how many we're dropping.

Bug: 774664
Change-Id: I2f901ad612763f36f84e8ea2cbb1b8d8909d9509
Reviewed-on: https://chromium-review.googlesource.com/773789Reviewed-by: Luke Z <lpz@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Nathan Parker <nparker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519959}