VR: Factor transient timing out of UiSceneManager.

chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc

Index: chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
diff --git a/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc b/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
index fc142a2a59446b6d2109390607d45f07893e1d07..55ebf3ba957e2afd09e9d3ff4bbecdb7b4d37350 100644
--- a/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
+++ b/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
@@ -165,6 +165,8 @@ TEST_F(UiSceneManagerTest, WebVrTransientWarningTimesOut) {
 }
 
 TEST_F(UiSceneManagerTest, ToastVisibility) {
+  base::ScopedMockTimeMessageLoopTaskRunner task_runner_;

[bshe, 2017/06/27 14:57:09]

Do you need this? Or do you want to add time sensitive test to this unit test
too?

[cjgrant, 2017/06/28 19:00:55]

Done.  I made a separate test to verify transience.

+
   // Tests toast not showing when directly entering VR though WebVR
   // presentation.
   MakeManager(kNotInCct, kInWebVr);
@@ -189,7 +191,7 @@ TEST_F(UiSceneManagerTest, ToastVisibility) {
   EXPECT_FALSE(IsVisible(kPresentationToast));
 
   manager_->SetWebVrMode(false, false, true);
-  EXPECT_TRUE(IsVisible(kPresentationToast));
+  EXPECT_FALSE(IsVisible(kPresentationToast));
 }
 
 TEST_F(UiSceneManagerTest, CloseButtonVisibleInCctFullscreen) {