The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c8338737f2ca338b165d64a876f4778f04e468d0

commit c8338737f2ca338b165d64a876f4778f04e468d0
Author: sebsg <sebsg@chromium.org>
Date: Thu Jul 20 19:38:45 2017

[Payments] Log the Payment Request event bitfield to UMA.

Bug:  746990 
Change-Id: Ib5aff32726225192d07c1a55b895d4f959110253
Reviewed-on: https://chromium-review.googlesource.com/579576
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488357}
[modify] https://crrev.com/c8338737f2ca338b165d64a876f4778f04e468d0/chrome/browser/ui/views/payments/payment_request_journey_logger_browsertest.cc
[modify] https://crrev.com/c8338737f2ca338b165d64a876f4778f04e468d0/components/payments/core/journey_logger.cc
[modify] https://crrev.com/c8338737f2ca338b165d64a876f4778f04e468d0/components/payments/core/journey_logger.h
[modify] https://crrev.com/c8338737f2ca338b165d64a876f4778f04e468d0/components/payments/core/journey_logger_unittest.cc
[modify] https://crrev.com/c8338737f2ca338b165d64a876f4778f04e468d0/tools/metrics/histograms/histograms.xml