Merge to XFA: Add embedder test for fix to bug_452455.

testing/resources/bug_452455.pdf

Index: testing/resources/bug_452455.pdf
diff --git a/testing/resources/bug_452455.pdf b/testing/resources/bug_452455.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..35d067cb298c13a5f057647b9791923c7b0fda7c
--- /dev/null
+++ b/testing/resources/bug_452455.pdf
@@ -0,0 +1,83 @@
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