The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5df6b07b38424493076c06f1a45c47558b0f3126

commit 5df6b07b38424493076c06f1a45c47558b0f3126
Author: Scott Haseley <shaseley@google.com>
Date: Tue Jul 03 22:19:36 2018

[scheduler] Add UMAs for task duration by task type after 5 and 10 minutes in background

We currently have metrics for task durations by queue type in background
after five and ten minutes, and this adds these metrics by task type. These
metrics will be useful for determining which exact tasks are running in the
background after tabs are frozen.

Bug:  858841 
Change-Id: I518167c3ff7029f383492d088cfbcb1d90e0a557
Reviewed-on: https://chromium-review.googlesource.com/1119375
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Scott Haseley <shaseley@google.com>
Cr-Commit-Position: refs/heads/master@{#572373}
[modify] https://crrev.com/5df6b07b38424493076c06f1a45c47558b0f3126/third_party/blink/renderer/platform/scheduler/main_thread/main_thread_metrics_helper.cc
[modify] https://crrev.com/5df6b07b38424493076c06f1a45c47558b0f3126/third_party/blink/renderer/platform/scheduler/main_thread/main_thread_metrics_helper.h
[modify] https://crrev.com/5df6b07b38424493076c06f1a45c47558b0f3126/tools/metrics/histograms/histograms.xml

Anything more to be done here?