Stay in VR while showing DOFF flow and connect CCT exit button to this.

chrome/browser/android/vr_shell/vr_shell_delegate.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/vr_shell_delegate.h"
 
 #include <utility>
 
 #include "base/android/jni_android.h"
 #include "base/callback_helpers.h"
@@ skipping 124 matching lines @@
     non_presenting_delegate_->Pause();
   }
 }
 
 void VrShellDelegate::OnResume(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   if (non_presenting_delegate_) {
     non_presenting_delegate_->Resume();
   }
 }
 
+void VrShellDelegate::UpdateNonPresentingContext(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj,
+    jlong context) {
+  gvr_context* ctx = reinterpret_cast<gvr_context*>(context);
+  non_presenting_delegate_->UpdateContext(ctx);
+}
+
 void VrShellDelegate::Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   delete this;
 }
 
 void VrShellDelegate::SetDeviceProvider(
     device::GvrDeviceProvider* device_provider) {
   if (device_provider_ == device_provider)
     return;
   if (device_provider_)
     ClearDeviceProvider();
@@ skipping 84 matching lines @@
 jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   return reinterpret_cast<intptr_t>(new VrShellDelegate(env, obj));
 }
 
 static void OnLibraryAvailable(JNIEnv* env, const JavaParamRef<jclass>& clazz) {
   device::GvrDelegateProvider::SetInstance(
       base::Bind(&VrShellDelegate::CreateVrShellDelegate));
 }
 
 }  // namespace vr_shell