Add Wait* API to ActionRunner to wrap over WaitAction.

tools/perf/page_sets/top_10.py

Index: tools/perf/page_sets/top_10.py
diff --git a/tools/perf/page_sets/top_10.py b/tools/perf/page_sets/top_10.py
index 0668d79116dc2a789dbd88202f903ec3c496ef71..51e84527aef95dae5ae505b21fcfedc0d140cd1e 100644
--- a/tools/perf/page_sets/top_10.py
+++ b/tools/perf/page_sets/top_10.py
@@ -22,8 +22,7 @@ class Google(SimpleScrollPage):
 
   def RunNavigateSteps(self, action_runner):
     super(Google, self).RunNavigateSteps(action_runner)
-    action_runner.RunAction(WaitAction(
-      {'condition': 'element', 'text': 'Next'}))
+    action_runner.WaitForElement(contains_text='Next')
 
 
 class Gmail(SimpleScrollPage):
@@ -55,9 +54,8 @@ class GoogleCalendar(SimpleScrollPage):
           elem.content="initial-scale=1";
           document.body.appendChild(elem);
         })();''')
-    action_runner.RunAction(WaitAction({'seconds' : 2}))
-    action_runner.RunAction(WaitAction({
-      'condition' : 'element', 'selector' : 'div[class~="navForward"]'}))
+    action_runner.Wait(2)
+    action_runner.WaitForElement('div[class~="navForward"]')
 
 
 class Youtube(SimpleScrollPage):
@@ -69,7 +67,7 @@ class Youtube(SimpleScrollPage):
 
   def RunNavigateSteps(self, action_runner):
     super(Youtube, self).RunNavigateSteps(action_runner)
-    action_runner.RunAction(WaitAction({'seconds' : 2}))
+    action_runner.Wait(2)
 
 
 class Facebook(SimpleScrollPage):
@@ -82,8 +80,7 @@ class Facebook(SimpleScrollPage):
 
   def RunNavigateSteps(self, action_runner):
     super(Facebook, self).RunNavigateSteps(action_runner)
-    action_runner.RunAction(WaitAction(
-      {'condition': 'element', 'text': 'About'}))
+    action_runner.WaitForElement(contains_text='About')
 
 
 class Top10PageSet(page_set_module.PageSet):