VrShell: Exit fullscreen on app button press.

chrome/browser/android/vr_shell/ui_scene_manager.cc

 // Copyright 2017 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/ui_scene_manager.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/android/vr_shell/textures/ui_texture.h"
 #include "chrome/browser/android/vr_shell/ui_elements/permanent_security_warning.h"
 #include "chrome/browser/android/vr_shell/ui_elements/transient_security_warning.h"
@@ skipping 205 matching lines @@
 
   ConfigureSecurityWarnings();
 }
 
 void UiSceneManager::SetWebVrSecureOrigin(bool secure) {
   secure_origin_ = secure;
   ConfigureSecurityWarnings();
 }
 
 void UiSceneManager::OnAppButtonClicked() {
-  // App button click exits the WebVR presentation.
+  // App button click exits the WebVR presentation and fullscreen.
   browser_->ExitPresent();
+  browser_->ExitFullscreen();
 }
 
 void UiSceneManager::OnAppButtonGesturePerformed(
     UiInterface::Direction direction) {}
 
 void UiSceneManager::SetFullscreen(bool fullscreen) {
-  // Make all VR scene UI elements visible if not in WebVR or fullscreen.
+  // Make all VR scene UI elements visible if not in fullscreen.
   for (UiElement* element : browser_ui_elements_) {
     element->set_visible(!fullscreen);
   }
 
   // Show the content quad in full screen.
   if (fullscreen) {
     scene_->SetBackgroundColor(kFullscreenBackgroundColor);
     main_content_->set_visible(true);
     main_content_->set_translation(
         {0, kFullscreenVerticalOffset, -kFullscreenDistance});
@@ skipping 46 matching lines @@
 void UiSceneManager::SetLoadProgress(double progress) {}
 
 void UiSceneManager::SetHistoryButtonsEnabled(bool can_go_back,
                                               bool can_go_forward) {}
 
 int UiSceneManager::AllocateId() {
   return next_available_id_++;
 }
 
 }  // namespace vr_shell