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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69

commit f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69
Author: Gayane Petrosyan <gayane@chromium.org>
Date: Wed May 23 19:50:47 2018

Always record for tests and whitelist expired histograms through field trial.

Expired histogram logic is disabled by default and is enabled by field trial.
The field trial will enable it for all the users. This is done so that
unit tests don't use expired histogram logic otherwise unit tests can fail
unexpectedly when histograms become expired.

The same field trial also has "whitelist" param that will contain names of
expired histograms that should be recorded.

Bug:  764030 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.linux:linux_mojo;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I60bf53d0a4a4cf126873e150b2b3ee6645e7d173
Reviewed-on: https://chromium-review.googlesource.com/1064726
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561216}
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/base/metrics/histogram_unittest.cc
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/base/metrics/statistics_recorder_unittest.cc
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/chrome/browser/chrome_browser_main.cc
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/components/metrics/BUILD.gn
[add] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/components/metrics/expired_histogram_util.cc
[add] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/components/metrics/expired_histogram_util.h
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/components/metrics/expired_histograms_checker.cc
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/components/metrics/expired_histograms_checker.h
[add] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/components/metrics/expired_histograms_checker_unittest.cc
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/ios/chrome/browser/BUILD.gn
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/ios/chrome/browser/ios_chrome_main_parts.mm
[modify] https://crrev.com/f3ecb14502b14c35e4d43a4a0ee88f7d4f5fbe69/ios/chrome/browser/metrics/BUILD.gn