[vr] Add incognito coloring

chrome/browser/android/vr_shell/vr_gl_thread.cc

Index: chrome/browser/android/vr_shell/vr_gl_thread.cc
diff --git a/chrome/browser/android/vr_shell/vr_gl_thread.cc b/chrome/browser/android/vr_shell/vr_gl_thread.cc
index 795cce1bced09cefb25f5a76bd869271e5fadd78..1b32261c1ccf66e8b5ac284eef34198c74ac6dd9 100644
--- a/chrome/browser/android/vr_shell/vr_gl_thread.cc
+++ b/chrome/browser/android/vr_shell/vr_gl_thread.cc
@@ -140,6 +140,13 @@ void VrGLThread::SetFullscreen(bool enabled) {
                                                 weak_scene_manager_, enabled));
 }
 
+void VrGLThread::SetIncognito(bool incognito) {
+  WaitUntilThreadStarted();
+  task_runner()->PostTask(
+      FROM_HERE, base::Bind(&UiSceneManager::SetIncognito, weak_scene_manager_,
+                            incognito));
+}
+
 void VrGLThread::SetHistoryButtonsEnabled(bool can_go_back,
                                           bool can_go_forward) {
   WaitUntilThreadStarted();