VR: Add a native UI element 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"
+
+namespace vr_shell {
+
+namespace {
+
+enum Elements {
+  // For now, use fixed element IDs, and ensure they do not collide with HTML UI
+  // dynamically-chosen ID numbers.
+  SecureOriginWarning = 1000,
+};
+
+}  // namespace
+
+UiSceneManager::UiSceneManager(UiScene* scene)
+    : scene_(scene), weak_ptr_factory_(this) {
+  // Create an invisible dummy warning quad. Actual security warnings will come
+  // in a follow-on chance.
+  auto warning = base::MakeUnique<UiElement>();
+  warning->id = Elements::SecureOriginWarning;
+  warning->name = "test quad";
+  warning->translation = {0, 0, -1};
+  warning->fill = vr_shell::Fill::NONE;
+  scene_->AddUiElement(std::move(warning));
+}
+
+UiSceneManager::~UiSceneManager() {}
+
+base::WeakPtr<UiSceneManager> UiSceneManager::GetWeakPtr() {
+  return weak_ptr_factory_.GetWeakPtr();
+}
+
+void UiSceneManager::UpdateScene(std::unique_ptr<base::ListValue> commands) {
+  scene_->HandleCommands(std::move(commands), base::TimeTicks::Now());
+}
+
+void UiSceneManager::SetWebVRMode(bool web_vr) {
+  web_vr_mode_ = web_vr;
+}
+
+void UiSceneManager::SetWebVRSecureOrigin(bool secure) {
+  secure_origin_ = secure;
+}
+
+}  // namespace vr_shell