The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c

commit aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c
Author: Moe Ahmadi <mahmadi@chromium.org>
Date: Tue Apr 17 20:54:49 2018

[UKM] Support --force-enable-metrics-reporting flag in iOS

Bug:  828878 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I76115730b550c8320e05c7c9fc1a20dd129f3626
Reviewed-on: https://chromium-review.googlesource.com/1012748
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551469}
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/chrome/browser/metrics/chrome_metrics_service_client.cc
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/chrome/common/chrome_switches.cc
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/chrome/common/chrome_switches.h
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/components/metrics/metrics_switches.cc
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/components/metrics/metrics_switches.h
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.mm
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.h
[modify] https://crrev.com/aeb09c61a5735b99ac85b0b0c29a0d1ffa3a585c/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm