[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 e4b1407530127507a6473a0f4064b8cc751293f5..1791aa85b92a6b18c464abe2e3173b177f4cb5e0 100644
--- a/chrome/browser/android/vr_shell/vr_gl_thread.cc
+++ b/chrome/browser/android/vr_shell/vr_gl_thread.cc
@@ -134,6 +134,13 @@ 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();