Update toast behavior and apperance according to UX requirement

chrome/browser/android/vr_shell/color_scheme.cc

Index: chrome/browser/android/vr_shell/color_scheme.cc
diff --git a/chrome/browser/android/vr_shell/color_scheme.cc b/chrome/browser/android/vr_shell/color_scheme.cc
index 178fe5b1830c45276b45c52f82ead8bec758eb3a..c65da25d48aafb400b504b681247d6b41049f585 100644
--- a/chrome/browser/android/vr_shell/color_scheme.cc
+++ b/chrome/browser/android/vr_shell/color_scheme.cc
@@ -40,10 +40,8 @@ void InitializeColorSchemes() {
       normal_scheme.exit_warning_foreground;
   normal_scheme.transient_warning_background =
       normal_scheme.exit_warning_background;
-  normal_scheme.exclusive_screen_toast_foreground =
-      normal_scheme.exit_warning_foreground;
-  normal_scheme.exclusive_screen_toast_background =
-      normal_scheme.exit_warning_background;
+  normal_scheme.exclusive_screen_toast_foreground = 0xCCFFFFFF;
+  normal_scheme.exclusive_screen_toast_background = 0xCC2F2F2F;
 
   normal_scheme.permanent_warning_foreground = 0xFF444444;
   normal_scheme.permanent_warning_background = SK_ColorWHITE;