Add tracing/bin/strip_memory_infra_trace

tracing/bin/strip_memory_infra_trace

 #!/usr/bin/env python
 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import sys
 
 if __name__ == '__main__':
   tracing_path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
   sys.path.append(tracing_path)
-  from tracing_build import merge_traces
-  sys.exit(merge_traces.Main(sys.argv))
+  from tracing_build import strip_memory_infra_trace
+  sys.exit(strip_memory_infra_trace.Main(sys.argv))