Include ukm.xml in metrics-metadata archive.

Follow up to https://chromium-review.googlesource.com/c/chromium/src/+/978942
which added it to the build, but did not include the result in the archive.

Change-Id: I0b5d1168397cace23c56206bd59f571e89111bfa
Reviewed-on: https://chromium-review.googlesource.com/996469
Reviewed-by: Michael Moss <[email protected]>
Commit-Queue: Steven Holte <[email protected]>
Cr-Commit-Position: refs/heads/master@{#550402}
1 file changed