GitLab

Add extract_histograms_test to metrics_python_tests so that
extract_histograms_test will be run by trybot.

Bug: 1114894
Change-Id: Ieae44071631a018e705dd11baa60fe0ab7cd9d7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347891
Commit-Queue: Steven Holte <holte@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796944}