Add barcode_test.pdf to testing/corpus/xfa_specific/pdfium R=thestig@chromium.org Review URL: https://codereview.chromium.org/2297313002 .

diff --git a/xfa_specific/pdfium/barcode_test.pdf b/xfa_specific/pdfium/barcode_test.pdf
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diff --git a/xfa_specific/pdfium/barcode_test.pdf.0.png b/xfa_specific/pdfium/barcode_test.pdf.0.png
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