Let's do all of them.

Agreed, we should definitely collect metrics on blocked permissions as well.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5893f141d406fd14f2888e6b094cdd0850668f37

commit 5893f141d406fd14f2888e6b094cdd0850668f37
Author: Ivan Sandrk <isandrk@google.com>
Date: Tue Jun 06 14:19:42 2017

Added UMA for extension permissions used in public sessions

Bug:  725103 
Change-Id: I46c6215520d0351f09d4a9fc88786d981aa5b949
Reviewed-on: https://chromium-review.googlesource.com/521602
Reviewed-by: Ivan Šandrk <isandrk@chromium.org>
Reviewed-by: Drew Wilson <atwilson@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477279}
[modify] https://crrev.com/5893f141d406fd14f2888e6b094cdd0850668f37/chrome/browser/chromeos/extensions/device_local_account_management_policy_provider.cc
[modify] https://crrev.com/5893f141d406fd14f2888e6b094cdd0850668f37/tools/metrics/histograms/histograms.xml

Your change meets the bar and is auto-approved for M60. Please go ahead and merge the CL to branch 3112 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(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/+/c84f9774b5959c2f80bddb897f3c5beefe992bc3

commit c84f9774b5959c2f80bddb897f3c5beefe992bc3
Author: Ivan Sandrk <isandrk@google.com>
Date: Wed Jun 07 14:29:00 2017

[Merge to M60] Added UMA for extension permissions used in public sessions

Bug:  725103 
Change-Id: I46c6215520d0351f09d4a9fc88786d981aa5b949
Reviewed-on: https://chromium-review.googlesource.com/521602
Reviewed-by: Ivan Šandrk <isandrk@chromium.org>
Reviewed-by: Drew Wilson <atwilson@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#477279}
Review-Url: https://codereview.chromium.org/2930653002 .
Cr-Commit-Position: refs/branch-heads/3112@{#222}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}

[modify] https://crrev.com/c84f9774b5959c2f80bddb897f3c5beefe992bc3/chrome/browser/chromeos/extensions/device_local_account_management_policy_provider.cc
[modify] https://crrev.com/c84f9774b5959c2f80bddb897f3c5beefe992bc3/tools/metrics/histograms/histograms.xml