GitLab

Implement multipage PDF file format saving capabilities atop PNG to PDF
image format conversion.

Bug: b:161237869
Change-Id: Ib74311185a3e4a6535b88042f203db956a77669a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580363
Commit-Queue: Kyra Moed <kmoed@google.com>
Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836719}