Convert bug_512557.in to bug_512557.pdf.

The .in files should be text files with LF line endings, so they should
not contain binary data. For bug_512557.in, the trigger for the bug
requires the image in the PDF to have /Filter /RunLengthDecode, and the
usual workaround of also ASCIIHex encoding the data does not work. Given
this, just convert the file to PDF.

Do the same for bug_304.in, which may be sensitive to the presence of
additional filters.

Bug: pdfium:1302
Change-Id: I6e0179e1968ea47e48b8c2cf3b1b5027512f2c4d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60572
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/testing/SUPPRESSIONS b/testing/SUPPRESSIONS
index d3f05df..8ee6d6c 100644
--- a/testing/SUPPRESSIONS
+++ b/testing/SUPPRESSIONS
@@ -326,7 +326,7 @@
 bug_492.in * nov8 *
 
 # TODO(pdfium:304): Remove after associated bug is fixed
-bug_304.in * * *
+bug_304.pdf * * *
 
 # TODO(pdfium:632): Remove after associated bug is fixed
 bug_632.in * * *
diff --git a/testing/resources/pixel/bug_304.in b/testing/resources/pixel/bug_304.pdf
similarity index 81%
rename from testing/resources/pixel/bug_304.in
rename to testing/resources/pixel/bug_304.pdf
index 9580579..c03734f 100644
--- a/testing/resources/pixel/bug_304.in
+++ b/testing/resources/pixel/bug_304.pdf
Binary files differ
diff --git a/testing/resources/pixel/bug_512557.in b/testing/resources/pixel/bug_512557.pdf
similarity index 81%
rename from testing/resources/pixel/bug_512557.in
rename to testing/resources/pixel/bug_512557.pdf
index 5f35334..8fa68f8 100644
--- a/testing/resources/pixel/bug_512557.in
+++ b/testing/resources/pixel/bug_512557.pdf
Binary files differ