Add coverage

tools/telemetry/third_party/coverage/tests/farm/run/src/showtrace.py

+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+# Show the current frame's trace function, so that we can test what the
+# command-line options do to the trace function used.
+
+import sys
+
+# Show what the trace function is.  If a C-based function is used, then f_trace
+# may be None.
+trace_fn = sys._getframe(0).f_trace
+if trace_fn is None:
+    trace_name = "None"
+else:
+    # Get the name of the tracer class.  Py3k has a different way to get it.
+    try:
+        trace_name = trace_fn.im_class.__name__
+    except AttributeError:
+        try:
+            trace_name = trace_fn.__self__.__class__.__name__
+        except AttributeError:
+            # A C-based function could also manifest as an f_trace value
+            # which doesn't have im_class or __self__.
+            trace_name = trace_fn.__class__.__name__
+
+print("%s %s" % (sys.argv[1], trace_name))