[vr] Add incognito coloring

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 a662ed84add6dfb669d28dd9ce23fc165f5e825e..33c9c3678fb6f1d5f906fdd95d8292b420c5b29e 100644
--- a/chrome/browser/android/vr_shell/color_scheme.cc
+++ b/chrome/browser/android/vr_shell/color_scheme.cc
@@ -27,6 +27,10 @@ void InitializeColorSchemes() {
   fullscreen_scheme.ceiling = {0.015686275, 0.031372549, 0.058823529, 1.0};
   fullscreen_scheme.floor_grid = {0.639215686, 0.878431373, 1.0, 0.5};
 
+  // TODO(joshcarpenter): choose unique colors for incognito.
+  kColorSchemes[ColorScheme::kModeIncognito] =
+      kColorSchemes[ColorScheme::kModeFullscreen];
+
   initialized = true;
 }