GitLab

The PDF plugin can receive a request to display a print preview with a 0
page count. It is a special meaning reserved for when the source of the
print preview is a PDF. In which case, just load the preview PDF in one
shot, instead of loading it incrementally.

BUG=746789

Change-Id: I3f9d99ebddffe9cedcc977dca03ccc2638f45011
Reviewed-on: https://chromium-review.googlesource.com/580495Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488455}