The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/74873eda7b56409211c03f3c29bb7506c2e0a48f

commit 74873eda7b56409211c03f3c29bb7506c2e0a48f
Author: Azeem Arshad <azeemarshad@chromium.org>
Date: Tue Nov 06 05:55:42 2018

[AndroidSms] Add metrics for Service Worker lifetime and PWA install code.

Bug:  896861 
Change-Id: Ida470c2da886409de0864da4f3a4dfdca117e03e
Reviewed-on: https://chromium-review.googlesource.com/c/1289575
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605606}
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/android_sms/BUILD.gn
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/android_sms/android_sms_service.cc
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/android_sms/connection_establisher_impl.cc
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/android_sms/connection_establisher_impl.h
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/android_sms/connection_establisher_impl_unittest.cc
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/multidevice_setup/android_sms_app_helper_delegate_impl.cc
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/chromeos/multidevice_setup/android_sms_app_helper_delegate_impl_unittest.cc
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/chrome/browser/web_applications/components/web_app_constants.h
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/74873eda7b56409211c03f3c29bb7506c2e0a48f/tools/metrics/histograms/histograms.xml