VR: Factor transient timing out of UiSceneManager.

chrome/browser/android/vr_shell/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//chrome/common/features.gni")
 import("//device/vr/features/features.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 60 matching lines @@
     "ui_elements/exit_prompt_backplane.h",
     "ui_elements/loading_indicator.cc",
     "ui_elements/loading_indicator.h",
     "ui_elements/screen_dimmer.cc",
     "ui_elements/screen_dimmer.h",
     "ui_elements/simple_textured_element.h",
     "ui_elements/system_indicator.cc",
     "ui_elements/system_indicator.h",
     "ui_elements/textured_element.cc",
     "ui_elements/textured_element.h",
+    "ui_elements/transience_manager.cc",
+    "ui_elements/transience_manager.h",
     "ui_elements/transient_url_bar.cc",
     "ui_elements/transient_url_bar.h",
     "ui_elements/ui_element.cc",
     "ui_elements/ui_element.h",
     "ui_elements/ui_element_debug_id.h",
     "ui_elements/url_bar.cc",
     "ui_elements/url_bar.h",
     "ui_interface.h",
     "ui_scene.cc",
     "ui_scene.h",
@@ skipping 109 matching lines @@
 test("vr_common_unittests") {
   sources = [
     "fps_meter_unittest.cc",
     "gltf_parser_unittest.cc",
     "run_all_unittests.cc",
     "test/paths.cc",
     "test/paths.h",
     "textures/close_button_texture_unittest.cc",
     "textures/url_bar_texture_unittest.cc",
     "ui_elements/exit_prompt_unittest.cc",
+    "ui_elements/transience_manager_unittest.cc",
     "ui_elements/ui_element_unittest.cc",
     "ui_scene_manager_unittest.cc",
     "ui_scene_unittest.cc",
   ]
 
   deps = [
     ":vr_common",
     "//base/test:test_support",
     "//components:components_tests_pak",
     "//components/security_state/core",
     "//components/toolbar:vector_icons",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 
   if (is_android) {
     deps += [ "//ui/android:ui_java" ]
   }
 
   data = [
     "test/data/",
     "$root_out_dir/components_tests_resources.pak",
   ]
 }