Add tsproxy logging

telemetry/telemetry/internal/util/ts_proxy_server.py

Index: telemetry/telemetry/internal/util/ts_proxy_server.py
diff --git a/telemetry/telemetry/internal/util/ts_proxy_server.py b/telemetry/telemetry/internal/util/ts_proxy_server.py
index b3076dac07621f650261bb69da079874920eead3..583fb5d45f93ddce19e0458f7b819b414700ed36 100644
--- a/telemetry/telemetry/internal/util/ts_proxy_server.py
+++ b/telemetry/telemetry/internal/util/ts_proxy_server.py
@@ -9,6 +9,7 @@ import os
 import re
 import subprocess
 import sys
+import tempfile
 
 from py_utils import atexit_with_log
 from telemetry.core import util
@@ -64,6 +65,13 @@ class TsProxyServer(object):
     if self._http_port:
       cmd_line.append(
           '--mapports=443:%s,*:%s' % (self._https_port, self._http_port))
+
+    tf = tempfile.NamedTemporaryFile(delete=False)
+    tf.close()
+    temp_path = tf.name
+    print 'Pipe tsproxy log to %s' % temp_path
+    cmd_line.append('--logfile=%s' % temp_path)
+    cmd_line.append('-vvv')
     logging.info('Tsproxy commandline: %r' % cmd_line)
     self._proc = subprocess.Popen(
         cmd_line, stdout=subprocess.PIPE, stdin=subprocess.PIPE,