The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/60d054d1f297debcae848680eead71f2517003fc

commit 60d054d1f297debcae848680eead71f2517003fc
Author: holte <holte@chromium.org>
Date: Wed May 03 20:14:16 2017

Allow empty UKM entries to be recorded.

BUG= 717793 

Review-Url: https://codereview.chromium.org/2855053002
Cr-Commit-Position: refs/heads/master@{#469101}

[modify] https://crrev.com/60d054d1f297debcae848680eead71f2517003fc/components/ukm/ukm_entry.cc
[modify] https://crrev.com/60d054d1f297debcae848680eead71f2517003fc/components/ukm/ukm_entry_builder.cc
[modify] https://crrev.com/60d054d1f297debcae848680eead71f2517003fc/components/ukm/ukm_service.h
[modify] https://crrev.com/60d054d1f297debcae848680eead71f2517003fc/components/ukm/ukm_service_unittest.cc

Early adding Merge-Request-59, so that approvals will trigger tomorrow afternoon (post-Canary).

Also, changing the priority and milestone, since it's critical for outreach.

Please tag with applicable OSs.  Thanks.

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c1fc814ad6f4c091de81292f9ce4c4bb8a5bf148

commit c1fc814ad6f4c091de81292f9ce4c4bb8a5bf148
Author: Steven Holte <holte@google.com>
Date: Thu May 04 20:27:29 2017

Allow empty UKM entries to be recorded.

BUG= 717793 

Review-Url: https://codereview.chromium.org/2855053002
Cr-Commit-Position: refs/heads/master@{#469101}
(cherry picked from commit 60d054d1f297debcae848680eead71f2517003fc)

Review-Url: https://codereview.chromium.org/2857983006 .
Cr-Commit-Position: refs/branch-heads/3071@{#406}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/c1fc814ad6f4c091de81292f9ce4c4bb8a5bf148/components/ukm/ukm_entry.cc
[modify] https://crrev.com/c1fc814ad6f4c091de81292f9ce4c4bb8a5bf148/components/ukm/ukm_entry_builder.cc
[modify] https://crrev.com/c1fc814ad6f4c091de81292f9ce4c4bb8a5bf148/components/ukm/ukm_service.h
[modify] https://crrev.com/c1fc814ad6f4c091de81292f9ce4c4bb8a5bf148/components/ukm/ukm_service_unittest.cc