[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 0ca080db215a00de11c0aea16a52db7c245ccac5..a2575e388008019d3891865bc526833b67db7ec0 100644
--- a/chrome/browser/android/vr_shell/vr_gl_thread.h
+++ b/chrome/browser/android/vr_shell/vr_gl_thread.h
@@ -64,6 +64,7 @@ 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;