Add Wait* API to ActionRunner to wrap over WaitAction.

tools/telemetry/telemetry/page/actions/action_runner_unittest.py

Index: tools/telemetry/telemetry/page/actions/action_runner_unittest.py
diff --git a/tools/telemetry/telemetry/page/actions/action_runner_unittest.py b/tools/telemetry/telemetry/page/actions/action_runner_unittest.py
index 827609701ee97297a60b4b78b56e91c7f00bd336..58abaf81dd32daa4534db015aec299cbc9677168 100644
--- a/tools/telemetry/telemetry/page/actions/action_runner_unittest.py
+++ b/tools/telemetry/telemetry/page/actions/action_runner_unittest.py
@@ -8,6 +8,7 @@ from telemetry.page.actions import action_runner as action_runner_module
 # pylint: disable=W0401,W0614
 from telemetry.page.actions.all_page_actions import *
 from telemetry.unittest import tab_test_case
+from telemetry.unittest import tab_test_case
 from telemetry.web_perf import timeline_interaction_record as tir_module
 
 
@@ -40,3 +41,66 @@ class ActionRunnerTest(tab_test_case.TabTestCase):
     self.Navigate('blank.html')
     action_runner.ExecuteJavaScript('var testing = 42;')
     self.assertEqual(42, self._tab.EvaluateJavaScript('testing'))
+
+  def testWait(self):
+    action_runner = action_runner_module.ActionRunner(self._tab)
+    self.Navigate('blank.html')
+
+    action_runner.ExecuteJavaScript(
+        'window.setTimeout(function() { window.testing = 101; }, 1000);')
+    action_runner.Wait(2)
+    self.assertEqual(101, self._tab.EvaluateJavaScript('window.testing'))
+
+    action_runner.ExecuteJavaScript(
+        'window.setTimeout(function() { window.testing = 102; }, 2000);')
+    action_runner.Wait(3)
+    self.assertEqual(102, self._tab.EvaluateJavaScript('window.testing'))
+
+  def testWaitForJavaScriptCondition(self):
+    action_runner = action_runner_module.ActionRunner(self._tab)
+    self.Navigate('blank.html')
+
+    action_runner.ExecuteJavaScript('window.testing = 219;')
+    action_runner.WaitForJavaScriptCondition(
+        'window.testing == 219', timeout=1)
+    action_runner.ExecuteJavaScript(
+        'window.setTimeout(function() { window.testing = 220; }, 1000);')
+    action_runner.WaitForJavaScriptCondition(
+        'window.testing == 220', timeout=2)
+    self.assertEqual(220, self._tab.EvaluateJavaScript('window.testing'))
+
+  def testWaitForElement(self):
+    action_runner = action_runner_module.ActionRunner(self._tab)
+    self.Navigate('blank.html')
+
+    action_runner.ExecuteJavaScript(
+        '(function() {'
+        '  var el = document.createElement("div");'
+        '  el.id = "test1";'
+        '  el.textContent = "foo";'
+        '  document.body.appendChild(el);'
+        '})()')
+    action_runner.WaitForElement('#test1', timeout=1)
+    action_runner.WaitForElement(contains_text='foo', timeout=1)
+    action_runner.WaitForElement(
+        element_function='document.getElementById("test1")')
+    action_runner.ExecuteJavaScript(
+        'window.setTimeout(function() {'
+        '  var el = document.createElement("div");'
+        '  el.id = "test2";'
+        '  document.body.appendChild(el);'
+        '}, 500)')
+    action_runner.WaitForElement('#test2', timeout=2)
+    action_runner.ExecuteJavaScript(
+        'window.setTimeout(function() {'
+        '  document.getElementById("test2").textContent = "bar";'
+        '}, 500)')
+    action_runner.WaitForElement(contains_text='bar', timeout=2)
+    action_runner.ExecuteJavaScript(
+        'window.setTimeout(function() {'
+        '  var el = document.createElement("div");'
+        '  el.id = "test3";'
+        '  document.body.appendChild(el);'
+        '}, 500)')
+    action_runner.WaitForElement(
+        element_function='document.getElementById("test3")')