Copy the event definition file to the testing directory along with pdf

data_binding.pdf is much closer now that events are sent.
It still diffs due to some bg color issues, not that the
box is unchecked.

Review-Url: https://codereview.chromium.org/1952823002
diff --git a/DEPS b/DEPS
index 146b6eb..32ae5ed 100644
--- a/DEPS
+++ b/DEPS
@@ -12,7 +12,7 @@
   'gmock_revision': '29763965ab52f24565299976b936d1265cb6a271',
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',
   'icu_revision': 'c291cde264469b20ca969ce8832088acb21e0c48',
-  'pdfium_tests_revision': '7e5050a49256a7350df9b8d7ad86e911eb83c021',
+  'pdfium_tests_revision': '6c769320872e6ca82da4adaec1a497237f71b543',
   'skia_revision': '6f47dbaff54a7705ef3e98f1f65c765e56fd9bd0',
   'trace_event_revision': 'd83d44b13d07c2fd0a40101a7deef9b93b841732',
   'v8_revision': '5cd0d8f27e3f740179a8a3de7b9d2c0cfae7afb9',