Add coverage

tools/telemetry/third_party/coverage/lab/run_trace.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
+
+"""Run a simple trace function on a file of Python code."""
+
+import os, sys
+
+nest = 0
+
+def trace(frame, event, arg):
+    global nest
+
+    if nest is None:
+        # This can happen when Python is shutting down.
+        return None
+
+    print "%s%s %s %d @%d" % (
+        "    " * nest,
+        event,
+        os.path.basename(frame.f_code.co_filename),
+        frame.f_lineno,
+        frame.f_lasti,
+        )
+
+    if event == 'call':
+        nest += 1
+    if event == 'return':
+        nest -= 1
+
+    return trace
+
+the_program = sys.argv[1]
+
+sys.settrace(trace)
+execfile(the_program)