Add simple script to regenerate expected results.

testing/tools/make_expected.sh

Index: testing/tools/make_expected.sh
diff --git a/testing/tools/make_expected.sh b/testing/tools/make_expected.sh
new file mode 100755
index 0000000000000000000000000000000000000000..282d41611c71fb777ba6340e82384754d235c44b
--- /dev/null
+++ b/testing/tools/make_expected.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+#
+# Script to generate expected result files.
+#
+
+while (( "$#" )); do
+  INFILE="$1"
+  out/Debug/pdfium_test --png $INFILE
+  RESULTS="$INFILE.*.png"
+  for RESULT in $RESULTS ; do

[Lei Zhang, 2015/07/30 21:18:16]

This won't work correctly if there's spaces in file names. You may want to check
and bail out if $INFILE has spaces.

I know we don't have any files with spaces in the filenames right now, but I'd
guard against that case.

+      EXPECTED=`echo -n $RESULT | sed 's/[.]pdf[.]/_expected.pdf./'`
+      mv $RESULT $EXPECTED
+  done
+  shift
+done