Enable vulcanizing perf_insights mapper

perf_insights/perf_insights/map_traces.py

Index: perf_insights/perf_insights/map_traces.py
diff --git a/perf_insights/perf_insights/map_traces.py b/perf_insights/perf_insights/map_traces.py
index 2e90bf8437fe2b413c526dc409616fd3bb698776..51bf67820a05f555428112f2dcf950c63aef0d32 100644
--- a/perf_insights/perf_insights/map_traces.py
+++ b/perf_insights/perf_insights/map_traces.py
@@ -56,8 +56,11 @@ def Main(argv):
       choices=_CORPUS_DRIVERS.keys(),
       default=_CORPUS_DRIVER_DEFAULT)
   parser.add_argument('--query')
-  parser.add_argument('map_file')
+  parser.add_argument('map_function_name')
+  parser.add_argument('--map-file')
 
+  parser.add_argument('--no-vulcanize', dest='vulcanize',
+                      action='store_false', default=True)
   parser.add_argument('-j', '--jobs', type=int, default=1)
   parser.add_argument('-o', '--output-file')
   parser.add_argument('-s', '--stop-on-error',
@@ -89,7 +92,7 @@ def Main(argv):
   init_args = cls.CheckAndCreateInitArguments(parser, args)
   corpus_driver = cls(**init_args)
 
-  if not os.path.exists(args.map_file):
+  if args.map_file and not os.path.exists(args.map_file):
     parser.error('Map does not exist.')
 
   if args.query == 'help':
@@ -106,12 +109,16 @@ def Main(argv):
 
   output_formatter = json_output_formatter.JSONOutputFormatter(ofile)
 
+  map_file_path = None
+  if args.map_file:
+    map_file_path = os.path.abspath(args.map_file)
   map_function_handle = map_function_handle_module.MapFunctionHandle(
-      filename=os.path.abspath(args.map_file))
+      filename=map_file_path, map_function_name=args.map_function_name)
   try:
     trace_handles = corpus_driver.GetTraceHandlesMatchingQuery(query)
     runner = map_runner.MapRunner(trace_handles, map_function_handle,
-                                  stop_on_error=args.stop_on_error)
+                                  stop_on_error=args.stop_on_error,
+                                  vulcanize=args.vulcanize)
     results = runner.Run(jobs=args.jobs, output_formatters=[output_formatter])
     if not results.had_failures:
       return 0