Fix the test case added in https://codereview.chromium.org/2277063003/

In [1], it was made a mistake in the way the test case
testing/resources/pixel/bug_492.pdf was generated.

This CL aims at fixing this mistake by:

1- keep making use of the new pdfium_test capability
   introduced by [1],
2- add a proper .in file for the test case to generate
   its respective .pdf file.

[1] https://codereview.chromium.org/2277063003/

BUG=pdfium:492

Review-Url: https://codereview.chromium.org/2286023002
diff --git a/testing/resources/pixel/bug_492.in b/testing/resources/pixel/bug_492.in
new file mode 100644
index 0000000..45c4a6f
--- /dev/null
+++ b/testing/resources/pixel/bug_492.in
@@ -0,0 +1,64 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Catalog
+  /Pages 2 0 R
+  /OpenAction 20 0 R
+>>
+endobj
+{{object 2 0}} <<
+  /Type /Pages
+  /Count 1
+  /Kids [
+    10 0 R
+  ]
+>>
+endobj
+% Page number 0.
+{{object 10 0}} <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <</F1 15 0 R>>
+  >>
+  /MediaBox [0 0 612 792]
+  /Annots [
+    22 0 R
+  ]
+  /Tabs /R
+>>
+endobj
+
+% OpenAction action
+{{object 20 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS 21 0 R
+>>
+endobj
+% JS program to exexute
+{{object 21 0}} <<
+>>
+stream
+  var annot = this.getAnnot(0, "Annot-1");
+  annot.hidden = false;
+endstream
+endobj
+
+{{object 22 0}} <<
+  /Type /Annot
+  /Subtype /Highlight
+  /Rect [ 475 681 512 690 ]
+  /NM (Annot-1)
+  /F 2
+  /QuadPoints [ 475 688 512 688 475 679 512 679 ]
+  /C [ 0.0001108646 0.001760244 0.9982184 ]
+  /Contents ()
+>>
+endobj
+
+{{xref}}
+trailer <<
+  /Root 1 0 R
+>>
+{{startxref}}
+%%EOF
diff --git a/testing/resources/pixel/bug_492.pdf b/testing/resources/pixel/bug_492.pdf
deleted file mode 100644
index 3a6486d..0000000
--- a/testing/resources/pixel/bug_492.pdf
+++ /dev/null
Binary files differ
diff --git a/testing/resources/pixel/bug_492.pdf.0.png b/testing/resources/pixel/bug_492.pdf.0.png
index c0fc1f4..adc4b53 100644
--- a/testing/resources/pixel/bug_492.pdf.0.png
+++ b/testing/resources/pixel/bug_492.pdf.0.png
Binary files differ