Add histograms for Smart Dim ML service calls

Bug: 893425
Test: Builds successfully.

Change-Id: I774f1e52f2111fffa13fb2a5d64427ecedc9591f
Reviewed-on: https://chromium-review.googlesource.com/c/1419266
Auto-Submit: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Andrew Moylan <amoylan@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Commit-Queue: Prashant Malani <pmalani@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624485}
1 file changed