The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/caa51f964608ecc0d4bae5df75de46481236faaf

commit caa51f964608ecc0d4bae5df75de46481236faaf
Author: Sasha Morrissey <sashab@chromium.org>
Date: Wed May 30 04:33:55 2018

Add UMA to record the number of Team Drives a user has

Add UMA to record the number of Team Drives a user has in the Files app.
This is recorded with a small count (1 to 100 team drives) in
FileBrowser.TeamDrivesCount.

Bug:  843872 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ic0941e1ef6b8417865d81235eb50338670e18386
Reviewed-on: https://chromium-review.googlesource.com/1070015
Commit-Queue: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562732}
[modify] https://crrev.com/caa51f964608ecc0d4bae5df75de46481236faaf/tools/metrics/histograms/histograms.xml
[modify] https://crrev.com/caa51f964608ecc0d4bae5df75de46481236faaf/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
[modify] https://crrev.com/caa51f964608ecc0d4bae5df75de46481236faaf/ui/file_manager/file_manager/foreground/js/ui/directory_tree_unittest.js