Add a pixel test for JPX image decoding.

Handwrite a PDF that triggers the relevant decoding path.

BUG=chromium:453723

Change-Id: I63aaeae5fcb8a0281411ae47bd7e1a1cf3821892
Reviewed-on: https://pdfium-review.googlesource.com/c/50990
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

testing/resources/pixel/bug_453723.in

diff --git a/testing/resources/pixel/bug_453723.in b/testing/resources/pixel/bug_453723.in
new file mode 100644
index 0000000..ed0a712
--- /dev/null
+++ b/testing/resources/pixel/bug_453723.in
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testing/resources/pixel/bug_453723_expected.pdf.0.png

diff --git a/testing/resources/pixel/bug_453723_expected.pdf.0.png b/testing/resources/pixel/bug_453723_expected.pdf.0.png
new file mode 100644
index 0000000..e1b3d43
--- /dev/null
+++ b/testing/resources/pixel/bug_453723_expected.pdf.0.png
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