The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6d78ae46074968cc7ab3a44b45fdc93941d0f15e

commit 6d78ae46074968cc7ab3a44b45fdc93941d0f15e
Author: atanasova <atanasova@chromium.org>
Date: Thu Mar 17 16:07:01 2016

Update FilteringResult UMA to include whitelist information.

Add new histogram value for hen a navigation is allowed due to it being
part of a whitelist.

BUG= 595640 

Review URL: https://codereview.chromium.org/1810923002

Cr-Commit-Position: refs/heads/master@{#381723}

[modify] https://crrev.com/6d78ae46074968cc7ab3a44b45fdc93941d0f15e/chrome/browser/supervised_user/supervised_user_resource_throttle.cc
[modify] https://crrev.com/6d78ae46074968cc7ab3a44b45fdc93941d0f15e/tools/metrics/histograms/histograms.xml