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

chrome/browser/android/vr_shell/vr_shell.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.h"
 
 #include <android/native_window_jni.h>
 
 #include <string>
 #include <utility>
@@ skipping 240 matching lines @@
     delegate_provider_->device_provider()->Device()->OnBlur();
   else
     delegate_provider_->device_provider()->Device()->OnFocus();
 }
 
 void VrShell::NavigateBack() {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_VrShellImpl_navigateBack(env, j_vr_shell_.obj());
 }
 
+void VrShell::ExitCct() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_VrShellImpl_exitCct(env, j_vr_shell_.obj());
+}
+
 void VrShell::OnTriggerEvent(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   WaitForGlThread();
   PostToGlThread(FROM_HERE, base::Bind(&VrShellGl::OnTriggerEvent,
                                        gl_thread_->GetVrShellGl()));
 }
 
 void VrShell::OnPause(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   WaitForGlThread();
   PostToGlThread(FROM_HERE,
                  base::Bind(&VrShellGl::OnPause, gl_thread_->GetVrShellGl()));
@@ skipping 379 matching lines @@
            jlong gvr_api,
            jboolean reprojected_rendering) {
   return reinterpret_cast<intptr_t>(new VrShell(
       env, obj, reinterpret_cast<ui::WindowAndroid*>(window_android),
       for_web_vr, in_cct,
       VrShellDelegate::GetNativeVrShellDelegate(env, delegate),
       reinterpret_cast<gvr_context*>(gvr_api), reprojected_rendering));
 }
 
 }  // namespace vr_shell