test events: add test_filename to all test-related events.

The test_filename is the full path to the TestCase class's
implementation file.

llvm-svn: 248060

lldb/test/test_results.py

@@ -78,6 +78,7 @@ class EventBuilder(object):
         event.update({
             "test_class": test_class_name,
             "test_name": test_name,
+            "test_filename": inspect.getfile(test.__class__)
         })
         return event