Revert "Remove histograms from feedback reports"

This reverts commit ffc0bb9b43023c171f5669aba5eb1c2911062f36.

Reason for revert: crbug.com/942082 There's a project in process to make
use of this data and it was removed just before that started, so we are
putting this data back into the feedback reports.

Original change's description:
> Remove histograms from feedback reports
>
> Histograms data were added to the feedback reports long
> time ago, but they're uncommonly checked and no good use
> for them has been found, hence removed.
>
> BUG=915227
> TEST=File a feedback report and make sure it ends up with
>      no histogram data.
>
> Change-Id: Ie8e3540e7afa700ebf4b770c1cee7df729268081
> Reviewed-on: https://chromium-review.googlesource.com/c/1401563
> Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
> Reviewed-by: Toni Baržić <tbarzic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#620988}

Bug: 915227, 942082
Change-Id: I68d59b57cc2483430f39c53e92cf8253ba144956
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532365
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#642703}
13 files changed