The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c822fa4a5f1fab740ab9572f0609b4c73a3ea0a8

commit c822fa4a5f1fab740ab9572f0609b4c73a3ea0a8
Author: Sahel Sharify <sahel@chromium.org>
Date: Thu May 03 17:30:06 2018

Remove TouchscreenScroll user action.

TouchscreenScroll user action used to show the frequency of GSBs
with touchscreen source; it's not needed anymore since the performance
scrolling metrics for ScrollBegin show the frequency.

Bug:  838700 
Change-Id: If74fc0ad2cda1ac4e2a3ae14939b04e468b2b35d
Reviewed-on: https://chromium-review.googlesource.com/1017015
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Sahel Sharifymoghaddam <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555786}
[modify] https://crrev.com/c822fa4a5f1fab740ab9572f0609b4c73a3ea0a8/content/browser/renderer_host/render_widget_host_view_event_handler.cc
[modify] https://crrev.com/c822fa4a5f1fab740ab9572f0609b4c73a3ea0a8/tools/metrics/actions/actions.xml