Add perf tests for starting Chrome with URL

tools/perf/measurements/startup.py

 # 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.
 
 from metrics import startup_metric
 from telemetry.page import page_measurement
 
 class Startup(page_measurement.PageMeasurement):
   """Performs a measurement of Chromium's startup performance.
 
   This test must be invoked with either --warm or --cold on the command line. A
   cold start means none of the Chromium files are in the disk cache. A warm
   start assumes the OS has already cached much of Chromium's content. For warm
   tests, you should repeat the page set to ensure it's cached.
   """
 
   def __init__(self):
-    super(Startup, self).__init__(needs_browser_restart_after_each_run=True)
+    super(Startup, self).__init__(needs_browser_restart_after_each_run=True,
+                                  action_name_to_run='navigate_steps')
 
   def AddCommandLineOptions(self, parser):
     parser.add_option('--cold', action='store_true',
                       help='Clear the OS disk cache before performing the test')
     parser.add_option('--warm', action='store_true',
                       help='Start up with everything already cached')
 
   def CustomizeBrowserOptions(self, options):
     # TODO: Once the bots start running benchmarks, enforce that either --warm
     # or --cold is explicitly specified.
     # assert options.warm != options.cold, \
     #     "You must specify either --warm or --cold"
     if options.cold:
       browser_options = options.browser_options
       browser_options.clear_sytem_cache_for_browser_and_profile_on_start = True
     else:
       self.discard_first_result = True
 
     options.AppendExtraBrowserArgs([
         '--enable-stats-collection-bindings'
     ])
 
   def RunNavigateSteps(self, page, tab):
     # Overriden so that no page navigation occurs - startup to the NTP.
     pass
 
   def MeasurePage(self, page, tab, results):
     startup_metric.StartupMetric().AddResults(tab, results)