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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+++ 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
new file mode 100644
index 0000000..3cb8aca
--- /dev/null
+++ b/xfa_specific/pdfium/barcode_test.pdf.0.png
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