Also archive diff files in layout-test-results.zip.

scripts/slave/chromium/archive_layout_test_results_unittest.py

Index: scripts/slave/chromium/archive_layout_test_results_unittest.py
diff --git a/scripts/slave/chromium/archive_layout_test_results_unittest.py b/scripts/slave/chromium/archive_layout_test_results_unittest.py
index fb4471bfb66a547bcedaea3074bba5e50aca6028..c92c11859c4ff3e5d1f0774560effc2e70d570c0 100755
--- a/scripts/slave/chromium/archive_layout_test_results_unittest.py
+++ b/scripts/slave/chromium/archive_layout_test_results_unittest.py
@@ -38,6 +38,18 @@ class ArchiveLayoutTestResultsTest(unittest.TestCase):
     self.assertFalse(archive_layout_test_results._IsActualResultFile(
         'foo-actual.html'))
 
+  def test_IsDiffFile(self):
+    self.assertTrue(archive_layout_test_results._IsDiffFile('a-diff.png'))
+    self.assertTrue(archive_layout_test_results._IsDiffFile('a-diff.txt'))
+    self.assertTrue(archive_layout_test_results._IsDiffFile('a-wdiff.txt'))
+    self.assertTrue(archive_layout_test_results._IsDiffFile('a-expected.txt'))
+    self.assertTrue(archive_layout_test_results._IsDiffFile('a-expected.html'))
+
+    self.assertFalse(archive_layout_test_results._IsDiffFile('a-diff.png.foo'))
+    self.assertFalse(archive_layout_test_results._IsDiffFile('a-diff.png.foo'))
+    self.assertFalse(archive_layout_test_results._IsDiffFile('foo-actual.html'))
+    self.assertFalse(archive_layout_test_results._IsDiffFile('results.html'))
+
 
 if __name__ == '__main__':
   unittest.main()