[Telemetry] Make session restore benchmark not require arguments.

tools/perf/measurements/session_restore.py

Index: tools/perf/measurements/session_restore.py
diff --git a/tools/perf/measurements/session_restore.py b/tools/perf/measurements/session_restore.py
index ff210b4f3b66e2d1be4cf800ffb98b351ccb0f1e..b45f6e544fa7fa0b56c51ab31f41191a5ec6f1b7 100644
--- a/tools/perf/measurements/session_restore.py
+++ b/tools/perf/measurements/session_restore.py
@@ -1,13 +1,17 @@
 # Copyright 2013 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 collections
+import logging
+import sys
 
 from measurements import startup
 from metrics import cpu
 from metrics import startup_metric
 from telemetry.core import util
 
+
 class SessionRestore(startup.Startup):
   """Performs a measurement of Chromium's Session restore performance.
 
@@ -26,6 +30,11 @@ class SessionRestore(startup.Startup):
     options.AppendExtraBrowserArgs([
         '--restore-last-session'
     ])
+    if not options.profile_dir:

[dtu, 2014/06/05 01:35:28]

Goes into ProcessCommandLineArgs still

+      logging.critical(
+          '--profile-dir or --profile-type is required for a session restore.\n'
+          'For more information see: http://goo.gl/ngdGD5')
+      sys.exit(1)
 
   def TabForPage(self, page, browser):
     # Detect that the session restore has completed.