Add missing content quad element to native scene manager.

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/ui_element.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
 
@@ skipping 44 matching lines @@
   // element->center_color = {128, 128, 128, 0.5};
   element->fill = vr_shell::Fill::NONE;
   element->size = {0.512f, 0.160f, 1};
   element->scale = {kWarningDistance, kWarningDistance, 1};
   element->translation = {0, 0, -kWarningDistance};
   element->visible = false;
   element->hit_testable = false;
   element->lock_to_fov = true;
   transient_security_warning_ = element.get();
   scene_->AddUiElement(std::move(element));
+
+  // Main web content quad.
+  element = base::MakeUnique<UiElement>();
+  element->id = id++;
+  element->name = "Content";
+  element->fill = vr_shell::Fill::CONTENT;
+  element->size = {(1.6f * (16 / 9)), 1.6f, 1};
+  element->translation = {0, 0, -2};
+  element->visible = false;
+  main_content_ = element.get();
+  scene_->AddUiElement(std::move(element));
 }
 
 UiSceneManager::~UiSceneManager() {}
 
 base::WeakPtr<UiSceneManager> UiSceneManager::GetWeakPtr() {
   return weak_ptr_factory_.GetWeakPtr();
 }
 
 void UiSceneManager::SetWebVRMode(bool web_vr) {
   web_vr_mode_ = web_vr;
+  main_content_->visible = !web_vr_mode_;
   ConfigureSecurityWarnings();
 }
 
 void UiSceneManager::SetWebVRSecureOrigin(bool secure) {
   secure_origin_ = secure;
   ConfigureSecurityWarnings();
 }
 
 void UiSceneManager::ConfigureSecurityWarnings() {
   bool enabled = web_vr_mode_ && !secure_origin_;
   permanent_security_warning_->visible = enabled;
   transient_security_warning_->visible = enabled;
   if (enabled) {
     security_warning_timer_.Start(
         FROM_HERE, base::TimeDelta::FromSeconds(kWarningTimeoutSeconds), this,
         &UiSceneManager::OnSecurityWarningTimer);
   } else {
     security_warning_timer_.Stop();
   }
 }
 
 void UiSceneManager::OnSecurityWarningTimer() {
   transient_security_warning_->visible = false;
 }
 
 }  // namespace vr_shell