[DFMs] Track install status via UMA

Bug: 923541
Change-Id: Ic5e2dbc0c6053e4bb5f2df792c894f45c8619580
Reviewed-on: https://chromium-review.googlesource.com/c/1426481
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625223}
3 files changed