App button click exits WebVR presentation.

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 65 matching lines @@
   main_thread_task_runner_->PostTask(
       FROM_HERE, base::Bind(&VrShell::ProcessContentGesture, weak_vr_shell_,
                             base::Passed(std::move(event))));
 }
 
 void VrGLThread::ForceExitVr() {
   main_thread_task_runner_->PostTask(
       FROM_HERE, base::Bind(&VrShell::ForceExitVr, weak_vr_shell_));
 }
 
+void VrGLThread::ExitPresent() {
+  main_thread_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&VrShell::ExitPresent, weak_vr_shell_));
+}
+
 void VrGLThread::RunVRDisplayInfoCallback(
     const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
     device::mojom::VRDisplayInfoPtr* info) {
   main_thread_task_runner_->PostTask(FROM_HERE,
                                      base::Bind(callback, base::Passed(info)));
 }
 
 void VrGLThread::OnContentPaused(bool enabled) {
   main_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&VrShell::OnContentPaused, weak_vr_shell_, enabled));
 }
 
 void VrGLThread::CleanUp() {
   scene_manager_.reset();
   vr_shell_gl_.reset();
   scene_.reset();
 }
 
 }  // namespace vr_shell