Add user provided test case for colorspaces.

BUG=chromium:691967

Change-Id: Ic0d89ee82c6d148442f96ec586d726e058808c6c
Reviewed-on: https://pdfium-review.googlesource.com/3115
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/pdfium/bug_691967.pdf b/pdfium/bug_691967.pdf
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+++ b/pdfium/bug_691967.pdf
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diff --git a/pdfium/bug_691967_expected.pdf.0.png b/pdfium/bug_691967_expected.pdf.0.png
new file mode 100644
index 0000000..0863d51
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+++ b/pdfium/bug_691967_expected.pdf.0.png
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