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This patch adds new entries to chrome://device-log with information about:
- the length of a resultant list of print servers calculated from policies
- results of querying each print servers (number of printers or error)
- the length of a final list of server printers.

BUG=chromium:1018552
TEST=tested on nautilus

Change-Id: I73516f73e3608e87b59d2a6980fbb52367d45ea4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882650Reviewed-by: Sean Kau <skau@chromium.org>
Reviewed-by: Luum Habtemariam <luum@chromium.org>
Commit-Queue: Piotr Pawliczek <pawliczek@chromium.org>
Auto-Submit: Piotr Pawliczek <pawliczek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710307}