The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/17c29f0c17718f25788178a675037c5521ee8de7

commit 17c29f0c17718f25788178a675037c5521ee8de7
Author: Gauthier Ambard <gambard@chromium.org>
Date: Tue Jun 26 14:57:16 2018

Add metrics for action extensions

This CL adds metrics for the actions triggered from the action
extensions.

Bug:  855989 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I6755c2af497f37361afbca9831a1fdc907badbe3
Reviewed-on: https://chromium-review.googlesource.com/1113451
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570406}
[modify] https://crrev.com/17c29f0c17718f25788178a675037c5521ee8de7/ios/chrome/browser/ui/activity_services/activities/bookmark_activity.mm
[modify] https://crrev.com/17c29f0c17718f25788178a675037c5521ee8de7/ios/chrome/browser/ui/activity_services/activities/find_in_page_activity.mm
[modify] https://crrev.com/17c29f0c17718f25788178a675037c5521ee8de7/ios/chrome/browser/ui/activity_services/activities/reading_list_activity.mm
[modify] https://crrev.com/17c29f0c17718f25788178a675037c5521ee8de7/ios/chrome/browser/ui/activity_services/activities/request_desktop_or_mobile_site_activity.mm
[modify] https://crrev.com/17c29f0c17718f25788178a675037c5521ee8de7/tools/metrics/actions/actions.xml