A browser side histogram (Blink.UseCounter.Features_TestBrowserProcessLogging) has been added (see details in  issue 716565 ).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/398cf0803ed34aaac96e94eff016529d391a4aa3

commit 398cf0803ed34aaac96e94eff016529d391a4aa3
Author: Luna Lu <loonybear@chromium.org>
Date: Tue Mar 13 21:22:46 2018

Rename UseCounter histograms

OOPIF is going to roll out in M67, this means the blink side UseCounter will no
longer be accurate. Switching to the browser side UseCounter in this CL.

However, there's still existing bugs where the browser sise UseCounter is not
working correctly, tracked in  crbug.com/811948 .

Bug:  811948 ,  716565 
Change-Id: I112f82d5f6b938dce4bbe394413068a8c3472498
Reviewed-on: https://chromium-review.googlesource.com/957472
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Rick Byers <rbyers@chromium.org>
Commit-Queue: Luna Lu <loonybear@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542913}
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/chrome/browser/page_load_metrics/observers/use_counter_page_load_metrics_observer.h
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/chrome/browser/ui/search/local_ntp_browsertest.cc
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/content/browser/service_worker/service_worker_browsertest.cc
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/third_party/WebKit/Source/core/frame/UseCounter.cpp
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/third_party/WebKit/Source/core/frame/UseCounterTest.cpp
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/third_party/WebKit/Source/core/loader/FrameFetchContextTest.cpp
[modify] https://crrev.com/398cf0803ed34aaac96e94eff016529d391a4aa3/tools/metrics/histograms/histograms.xml