The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f7f0f1c1aae1bfc819afddb0024d14af0d3c8ff4

commit f7f0f1c1aae1bfc819afddb0024d14af0d3c8ff4
Author: elawrence <elawrence@chromium.org>
Date: Fri May 19 20:21:59 2017

Add UseCounter to measure edits to text fields by security state

To evaluate the impact and effectiveness of HTTPBad Phase 2's
form field warnings, we need to record how many page loads result
in the user entering data in a text field on the page, split by
whether or not the form field's context is secure.

BUG= 724260 

NOTRY=true

Review-Url: https://codereview.chromium.org/2894693002
Cr-Commit-Position: refs/heads/master@{#473294}

[modify] https://crrev.com/f7f0f1c1aae1bfc819afddb0024d14af0d3c8ff4/third_party/WebKit/Source/core/frame/UseCounter.h
[modify] https://crrev.com/f7f0f1c1aae1bfc819afddb0024d14af0d3c8ff4/third_party/WebKit/Source/web/ChromeClientImpl.cpp
[modify] https://crrev.com/f7f0f1c1aae1bfc819afddb0024d14af0d3c8ff4/tools/metrics/histograms/enums.xml