copy the pica benchmark to polymer_load

tools/perf/page_sets/pica.py

 # Copyright 2014 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.
 # pylint: disable=W0401,W0614
 from telemetry.page.actions.all_page_actions import *
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
+from measurements import polymer_load
 
 
-class PicaPage(page_module.PageWithDefaultRunNavigate):
+class PicaPage(polymer_load.PageForPolymerLoad):
 
   def __init__(self, page_set):
     super(PicaPage, self).__init__(
       url='http://localhost/polymer/projects/pica/',
       page_set=page_set)
     self.archive_data_file = 'data/pica.json'
-    self.script_to_evaluate_on_commit = '''
-    document.addEventListener('polymer-ready', function() {
-      var unused = document.body.offsetHeight;
-      window.__pica_load_time = performance.now();
-      setTimeout(function(){window.__polymer_ready=true}, 1000)
-    })'''
-
-  def RunNavigateSteps(self, action_runner):
-    action_runner.RunAction(NavigateAction())
-    action_runner.RunAction(WaitAction(
-      {
-        'javascript': 'window.__polymer_ready'
-      }))
 
 
 class PicaPageSet(page_set_module.PageSet):
 
   """ Pica demo app for the Polymer UI toolkit """
 
   def __init__(self):
     super(PicaPageSet, self).__init__(
       archive_data_file='data/pica.json')
 
     self.AddPage(PicaPage(self))