Add a test case with a "huge" image.

BUG=chromium:898443

Change-Id: I5208701dd082732af38bfc5af90b259aaf92196a
Reviewed-on: https://pdfium-review.googlesource.com/c/44731
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/pdfium/bug_898443.pdf b/pdfium/bug_898443.pdf
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+++ b/pdfium/bug_898443.pdf
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diff --git a/pdfium/bug_898443_expected.pdf.0.png b/pdfium/bug_898443_expected.pdf.0.png
new file mode 100644
index 0000000..ca7e59f
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+++ b/pdfium/bug_898443_expected.pdf.0.png
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