Disable back button when stack is empty

chrome/browser/android/vr_shell/vr_gl_thread.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_gl_thread.h"
 
 #include <utility>
 
 #include "chrome/browser/android/vr_shell/ui_interface.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
@@ skipping 134 matching lines @@
   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();
   task_runner()->PostTask(
       FROM_HERE, base::Bind(&UiSceneManager::SetHistoryButtonsEnabled,
-                            weak_scene_manager_, can_go_forward, can_go_back));
+                            weak_scene_manager_, can_go_back, can_go_forward));
 }
 
 void VrGLThread::SetLoadProgress(float progress) {
   WaitUntilThreadStarted();
   task_runner()->PostTask(FROM_HERE,
                           base::Bind(&UiSceneManager::SetLoadProgress,
                                      weak_scene_manager_, progress));
 }
 
 void VrGLThread::SetLoading(bool loading) {
@@ skipping 52 matching lines @@
                                                 weak_scene_manager_));
 }
 
 void VrGLThread::CleanUp() {
   scene_manager_.reset();
   vr_shell_gl_.reset();
   scene_.reset();
 }
 
 }  // namespace vr_shell