VR: Add support for time-aware unit tests.

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 38b82414712b3d60651a222fd83c09b15bff338c..4bfbb4ecfa776b12c7406feba74db4a9f606a570 100644
--- a/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
+++ b/chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc
@@ -6,7 +6,8 @@
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
-#include "base/test/scoped_task_environment.h"
+#include "base/message_loop/message_loop.h"
+#include "base/test/scoped_mock_time_message_loop_task_runner.h"
 #include "chrome/browser/android/vr_shell/ui_browser_interface.h"
 #include "chrome/browser/android/vr_shell/ui_elements/ui_element.h"
 #include "chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h"
@@ -102,7 +103,8 @@ class UiSceneManagerTest : public testing::Test {
     return true;
   }
 
-  base::test::ScopedTaskEnvironment scoped_task_environment_;
+  base::MessageLoop message_loop_;
+  base::ScopedMockTimeMessageLoopTaskRunner task_runner_;

[bshe, 2017/06/26 15:40:17]

optional nit: should we define this in the test that are time aware? Not sure
how many other tests need this.

[cjgrant, 2017/06/26 16:26:35]

Done.

   std::unique_ptr<MockBrowserInterface> browser_;
   std::unique_ptr<UiScene> scene_;
   std::unique_ptr<UiSceneManager> manager_;
@@ -148,6 +150,18 @@ TEST_F(UiSceneManagerTest, WebVrWarningsDoNotShowWhenInitiallyOutsideWebVr) {
   EXPECT_TRUE(IsVisible(kWebVrTransientHttpSecurityWarning));
 }
 
+TEST_F(UiSceneManagerTest, WebVrTransientWarningTimesOut) {
+  MakeManager(kNotInCct, kInWebVr);
+
+  EXPECT_TRUE(IsVisible(kWebVrTransientHttpSecurityWarning));
+  // TODO(crbug.com/736558): Fast forwarding appears broken in conjunction with

[ymalik, 2017/06/26 14:55:21]

Nit: Spoke offline, since there's nothing actionable here, probably make this a
note?

[cjgrant, 2017/06/26 16:26:35]

Done.  And improved the explanation.

+  // restarting timers. Here, we can fast forward by the appropriate time
+  // interval, but in other cases (until the bug is addressed), we could fast
+  // forward until all tasks are addresed.
+  task_runner_->FastForwardBy(base::TimeDelta::FromSeconds(31));
+  EXPECT_FALSE(IsVisible(kWebVrTransientHttpSecurityWarning));
+}
+
 TEST_F(UiSceneManagerTest, ToastVisibility) {
   // Tests toast not showing when directly entering VR though WebVR
   // presentation.