[vr] Clicking on the security icon should prompt the user to bail out of VR

chrome/browser/android/vr_shell/BUILD.gn

Index: chrome/browser/android/vr_shell/BUILD.gn
diff --git a/chrome/browser/android/vr_shell/BUILD.gn b/chrome/browser/android/vr_shell/BUILD.gn
index f09c5014f908141bb7f89f3bb36eb14e466f9ddd..f7dc10458393c1bec4a8662893adecfc6bb7b0d5 100644
--- a/chrome/browser/android/vr_shell/BUILD.gn
+++ b/chrome/browser/android/vr_shell/BUILD.gn
@@ -32,6 +32,8 @@ if (current_cpu == "arm" || current_cpu == "arm64") {
       "textures/button_texture.h",
       "textures/close_button_texture.cc",
       "textures/close_button_texture.h",
+      "textures/exit_prompt_texture.cc",
+      "textures/exit_prompt_texture.h",
       "textures/exit_warning_texture.cc",
       "textures/exit_warning_texture.h",
       "textures/insecure_content_permanent_texture.cc",
@@ -52,6 +54,8 @@ if (current_cpu == "arm" || current_cpu == "arm64") {
       "ui_elements/audio_capture_indicator.h",
       "ui_elements/button.cc",
       "ui_elements/button.h",
+      "ui_elements/exit_prompt.cc",
+      "ui_elements/exit_prompt.h",
       "ui_elements/exit_warning.cc",
       "ui_elements/exit_warning.h",
       "ui_elements/loading_indicator.cc",
@@ -187,6 +191,7 @@ test("vr_shell_unittests") {
     "test/paths.h",
     "textures/close_button_texture_unittest.cc",
     "textures/url_bar_texture_unittest.cc",
+    "ui_elements/exit_prompt_unittest.cc",
     "ui_elements/ui_element_unittest.cc",
     "ui_scene_manager_unittest.cc",
     "ui_scene_unittest.cc",
@@ -200,6 +205,7 @@ test("vr_shell_unittests") {
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
+    "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]