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

chrome/browser/android/vr_shell/ui_scene.h

Index: chrome/browser/android/vr_shell/ui_scene.h
diff --git a/chrome/browser/android/vr_shell/ui_scene.h b/chrome/browser/android/vr_shell/ui_scene.h
index e12cf63cbaaadd45f95b62d339402fdae0204ede..bcd4ba1f46b7f4b7a0ed6bdcf02f7f86a08b4171 100644
--- a/chrome/browser/android/vr_shell/ui_scene.h
+++ b/chrome/browser/android/vr_shell/ui_scene.h
@@ -80,6 +80,8 @@ class UiScene {
 
   bool is_exiting() const { return is_exiting_; }
   void set_is_exiting();
+  bool is_prompting_to_exit() { return is_prompting_to_exit_; }
+  void set_is_prompting_to_exit(bool prompting);
 
   void OnGLInitialized();
 
@@ -95,6 +97,7 @@ class UiScene {
   bool webvr_rendering_enabled_ = true;
   bool gl_initialized_ = false;
   bool is_exiting_ = false;
+  bool is_prompting_to_exit_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(UiScene);
 };