Add Wait* API to ActionRunner to wrap over WaitAction.

tools/perf/page_sets/mobile_memory.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
 
 
 class MobileMemoryPage(page_module.Page):
@@ skipping 13 matching lines @@
         page_set=page_set)
 
     self.reload_and_gc = [{'action': 'reload'},
                           {'action': 'wait',
                            'seconds': 15},
                           {'action': 'js_collect_garbage'}]
     self.credentials = 'google'
 
   def ReloadAndGc(self, action_runner):
     action_runner.RunAction(ReloadAction())
-    action_runner.RunAction(WaitAction(
-        {
-            'seconds': 15
-        }))
+    action_runner.Wait(15)
     action_runner.RunAction(JsCollectGarbageAction())
 
   def RunStressMemory(self, action_runner):
     for _ in xrange(3):
       self.ReloadAndGc(action_runner)
 
 
 class GoogleSearchPage(MobileMemoryPage):
 
   """ Why: Tests usage of discardable memory """
 
   def __init__(self, page_set):
     super(GoogleSearchPage, self).__init__(
         url='https://www.google.com/search?site=&tbm=isch&q=google',
         page_set=page_set)
 
   def RunStressMemory(self, action_runner):
     action_runner.RunAction(ScrollAction())
-    action_runner.RunAction(WaitAction(
-        {
-            'seconds': 3
-        }))
+    action_runner.Wait(3)
     action_runner.RunAction(ScrollAction())
-    action_runner.RunAction(WaitAction(
-        {
-            'seconds': 3
-        }))
+    action_runner.Wait(3)
     action_runner.RunAction(ScrollAction())
-    action_runner.RunAction(WaitAction(
-        {
-            'seconds': 3
-        }))
+    action_runner.Wait(3)
     action_runner.RunAction(ScrollAction())
-    action_runner.RunAction(WaitAction(
-        {
-            'javascript':
-              'document.getElementById("rg_s").childElementCount > 300'
-        }))
+    action_runner.WaitForJavaScriptCondition(
+        'document.getElementById("rg_s").childElementCount > 300')
 
 
 class ScrollPage(MobileMemoryPage):
 
   def __init__(self, url, page_set):
     super(ScrollPage, self).__init__(url=url, page_set=page_set)
 
   def RunStressMemory(self, action_runner):
     action_runner.RunAction(ScrollAction())
 
@@ skipping 15 matching lines @@
       # Why: Renderer process memory bloat
       'http://techcrunch.com',
       # pylint: disable=C0301
       'http://techcrunch.com/2014/02/17/pixel-brings-brings-old-school-video-game-art-to-life-in-your-home/',
       'http://techcrunch.com/2014/02/15/kickstarter-coins-2/',
       'http://techcrunch.com/2014/02/15/was-y-combinator-worth-it/',
     ]
 
     for url in urls_list:
       self.AddPage(ScrollPage(url, self))