[telemetry] Add support for dispatching key events

telemetry/telemetry/internal/actions/action_runner_unittest.py

Index: telemetry/telemetry/internal/actions/action_runner_unittest.py
diff --git a/telemetry/telemetry/internal/actions/action_runner_unittest.py b/telemetry/telemetry/internal/actions/action_runner_unittest.py
index a708e0efba999f2e9d5cfe5cf5a52f99b001433f..7cd68cd6c50e474d872afb30ccd57f4733a0c2e9 100644
--- a/telemetry/telemetry/internal/actions/action_runner_unittest.py
+++ b/telemetry/telemetry/internal/actions/action_runner_unittest.py
@@ -255,6 +255,31 @@ class ActionRunnerTest(tab_test_case.TabTestCase):
     self.assertTrue(action_runner.EvaluateJavaScript(
         '(document.scrollingElement || document.body).scrollLeft') > 75)
 
+  def testEnterText(self):
+    self.Navigate('blank.html')
+    self._tab.ExecuteJavaScript(
+        '(function() {'
+        '  var elem = document.createElement("textarea");'
+        '  document.body.appendChild(elem);'
+        '  elem.focus();'
+        '})();')
+
+    action_runner = action_runner_module.ActionRunner(self._tab,
+                                                      skip_waits=True)
+    action_runner.EnterText('That is boring')  # That is boring|.
+    action_runner.PressKey('Home')  # |That is boring.
+    action_runner.PressKey('ArrowRight', repeat_count=2)  # Th|at is boring.
+    action_runner.PressKey('Delete', repeat_count=2)  # Th| is boring.
+    action_runner.EnterText('is')  # This| is boring.
+    action_runner.PressKey('End')  # This is boring|.
+    action_runner.PressKey('ArrowLeft', repeat_count=3)  # This is bor|ing.
+    action_runner.PressKey('Backspace', repeat_count=3)  # This is |ing.
+    action_runner.EnterText('interest')  # This is interest|ing.
+
+    self.assertEqual('This is interesting',
+                     self._tab.EvaluateJavaScript(
+                         'document.querySelector("textarea").value'))
+
 
 class InteractionTest(unittest.TestCase):