Add Skia expectation for lines.pdf

Bug: pdfium:1957
Change-Id: I15446d06777bea3b3656a6024315cfae0c320d20
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/103333
Reviewed-by: K. Moon <kmoon@chromium.org>
1 file changed