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When the user selects a file to be used as a PPD for a printer to be
added, a simple check is made to verify if the selected file looks to be
a PPD. This does not perform a full validation of the PPD file and is
just to help notify the user if they've selected a file which is
obviously wrong.

R=skau@chromium.org, xdai@chromium.org

Bug: 778462
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I794a48c84d176b979e9bfdcf90ee5049f08f4541
Reviewed-on: https://chromium-review.googlesource.com/887858
Commit-Queue: David Valleau <valleau@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533792}