Expose AppUi from devil utils in browser

telemetry/telemetry/internal/browser/browser_unittest.py

Index: telemetry/telemetry/internal/browser/browser_unittest.py
diff --git a/telemetry/telemetry/internal/browser/browser_unittest.py b/telemetry/telemetry/internal/browser/browser_unittest.py
index 02026cc75a5c8fd03c9f5173ba11c107ff58cfe4..d7c00966bc59d7f9f432d952a6f691524c2462d5 100644
--- a/telemetry/telemetry/internal/browser/browser_unittest.py
+++ b/telemetry/telemetry/internal/browser/browser_unittest.py
@@ -20,6 +20,8 @@ from telemetry.testing import browser_test_case
 from telemetry.testing import options_for_unittests
 from telemetry.timeline import tracing_config
 
+from devil.android import app_ui
+
 import mock
 import py_utils
 
@@ -138,6 +140,13 @@ class BrowserTest(browser_test_case.BrowserTestCase):
     tracing_controller.StopTracing()
     self.assertFalse(tracing_controller.is_tracing_running)
 
+  @decorators.Enabled('android')
+  def testGetAppUi(self):
+    self.assertTrue(self._browser.supports_app_ui_interactions)
+    ui = self._browser.GetAppUi()
+    self.assertTrue(isinstance(ui, app_ui.AppUi))
+    self.assertIsNotNone(ui.WaitForUiNode(resource_id='action_bar_root'))
+
 
 class CommandLineBrowserTest(browser_test_case.BrowserTestCase):
   @classmethod