Add Wait* API to ActionRunner to wrap over WaitAction.

tools/perf/page_sets/top_desktop_sites_2012Q3.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.page_set import PageSet
 from telemetry.page.page import Page
 
 
 class Top2012Q3Page(Page):
 
   def __init__(self, url, page_set):
     super(Top2012Q3Page, self).__init__(url=url, page_set=page_set)
     self.make_javascript_deterministic = True
     self.credentials_path = 'data/credentials.json'
     self.archive_data_file = 'data/2012Q3.json'
 
   def ReloadAndGc(self, action_runner):
     action_runner.RunAction(ReloadAction())
-    action_runner.RunAction(WaitAction({"seconds": 1}))
+    action_runner.Wait(1)
     action_runner.RunAction(JsCollectGarbageAction())
 
   def RunSmoothness(self, action_runner):
     action_runner.RunAction(ScrollAction())
 
   def RunStressMemory(self, action_runner):
     for _ in xrange(3):
       self.ReloadAndGc(action_runner)
 
 
@@ skipping 237 matching lines @@
       'http://www.target.com/c/women/-/N-5xtd3#?lnk=nav_t_spc_1_0',
       'http://dianxin.cn',
       'http://www.aizhan.com/siteall/www.youboy.com/',
       'http://veiculos-home.mercadolivre.com.br/',
       'http://kakaku.com',
       'http://flipkart.com',
       'http://paipai.com']
 
     for url in urls_list:
       self.AddPage(Top2012Q3Page(url, self))