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This will help understand how frequently Shaka packager is used in
the wild. If usage is high enough we may add a UKM to figure out
whom it's most popular with.

BUG=927952

Change-Id: I144fa524fd2450e5fdd31f9baa24a9bc7b6bfbee
Reviewed-on: https://chromium-review.googlesource.com/c/1464921
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636273}