Setup testing XFA using .in fileschromium/3355chromium/3354

This adds a number of {{}} style tags to the .in format that allow the
fix-up script to inject XFA related boilerplate into the PDF, instead of
having the .in file replicate this.

A simple example XFA .in file, called xfa_example.in has been added as a
template for future files to follow.

Finally a run_xfa_tests.py has been added for executing all of the tests
in testing/resources/xfa, which from what I can tell are not executed any
other way. All of the existing PDFs in that directory are currently
suppressed.

BUG=pdfium:1008

Change-Id: Ie055b6640969ce8291b4c96b401ebf6887dfa0c0
Reviewed-on: https://pdfium-review.googlesource.com/27631
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

0 files changed, 0 insertions, 0 deletions