GitLab

Make use of the PpdCache from PrintPreview.  Setup downloading ppds from
the quirks server.

BUG=662755
TEST=Setup a printer.  Log out.  Rename ppd file.  Open printer from print
preview.

Review-Url: https://codereview.chromium.org/2542363002
Cr-Commit-Position: refs/heads/master@{#437718}