[vr] Add incognito coloring

chrome/browser/android/vr_shell/vr_gl_thread.h

Index: chrome/browser/android/vr_shell/vr_gl_thread.h
diff --git a/chrome/browser/android/vr_shell/vr_gl_thread.h b/chrome/browser/android/vr_shell/vr_gl_thread.h
index 3f8f437299c9f3cc87a79c9a36bba559b36f0e4b..e1e71e30823b152313bac18a0041c986006d08df 100644
--- a/chrome/browser/android/vr_shell/vr_gl_thread.h
+++ b/chrome/browser/android/vr_shell/vr_gl_thread.h
@@ -63,6 +63,7 @@ class VrGLThread : public base::Thread,
 
   // UiInterface implementation (VrShell calling to the UI).
   void SetFullscreen(bool enabled) override;
+  void SetIncognito(bool incognito) override;
   void SetHistoryButtonsEnabled(bool can_go_back, bool can_go_forward) override;
   void SetLoadProgress(float progress) override;
   void SetLoading(bool loading) override;