Fix event sending in pdfium_test.

Passing bad args in pdfium_test -- all void* pointers look alike.
Make output less verbose while we're here. Turn on event sending
mode for corups tests. No effect until .evt files added to corpus.

Review-Url: https://codereview.chromium.org/1946873004
diff --git a/testing/tools/test_runner.py b/testing/tools/test_runner.py
index 6bd2d72..bc4ad05 100644
--- a/testing/tools/test_runner.py
+++ b/testing/tools/test_runner.py
@@ -91,7 +91,8 @@
 
   def TestPixel(self, input_root, pdf_path):
     cmd_to_run = common.DrMemoryWrapper(self.drmem_wrapper, input_root)
-    cmd_to_run.extend([self.pdfium_test_path, '--png', pdf_path])
+    cmd_to_run.extend([self.pdfium_test_path, '--send-events', '--png',
+                       pdf_path])
     return common.RunCommand(cmd_to_run)