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- Adds functionality to CupsPrinterManager for allowing
  other classes to query for printer statuses.

- CupsPrinterManager accepts a list of printer ids then kicks off an
  asynchronous printer status query for each printer. The printer
  status is cached using SavePrinterStatus.

Bug: 1059607
Change-Id: Ie9ea5192fc046b106e3e299bf75cadb43e746605
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102770
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760230}