Add kerning test for bug 528103

Bug: chromium:528103
Change-Id: I990c829af8c6a9f481a34fc0e25de6814bbab34a
Reviewed-on: https://pdfium-review.googlesource.com/5633
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>
diff --git a/testing/resources/pixel/bug_528103.in b/testing/resources/pixel/bug_528103.in
new file mode 100644
index 0000000..9223b0b
--- /dev/null
+++ b/testing/resources/pixel/bug_528103.in
@@ -0,0 +1,47 @@
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