Create ActionRunner wrapper API over TapAction and ClickElementAction.

tools/telemetry/telemetry/page/actions/javascript_click.py

Index: tools/telemetry/telemetry/page/actions/javascript_click.py
diff --git a/tools/telemetry/telemetry/page/actions/javascript_click.py b/tools/telemetry/telemetry/page/actions/javascript_click.py
index 2fc9fab6fbd3dd66e61b5dfcd1cc72d509e05323..82745a7551196774f372cb9e50b65d2279d0b032 100644
--- a/tools/telemetry/telemetry/page/actions/javascript_click.py
+++ b/tools/telemetry/telemetry/page/actions/javascript_click.py
@@ -17,7 +17,15 @@ class ClickElementAction(page_action.PageAction):
 
   def RunAction(self, tab):
     def DoClick():
-      if hasattr(self, 'selector'):
+      if hasattr(self, 'element_function'):
+        code = '(%s).click();' % self.element_function
+        try:
+          tab.ExecuteJavaScript(code)
+        except exceptions.EvaluateException:
+          raise page_action.PageActionFailed(
+              'Cannot find element with element_function ' +
+              self.element_function)
+      elif hasattr(self, 'selector'):
         code = ('document.querySelector(\'' + _EscapeSelector(self.selector) +
             '\').click();')
         try: