VR: Add a loading indicator to the scene.

chrome/browser/android/vr_shell/ui_scene_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_MANAGER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "base/values.h"
 #include "chrome/browser/android/vr_shell/ui_interface.h"
 
 class GURL;
 
 namespace vr_shell {
 
+class LoadingIndicator;
 class UiElement;
 class UiScene;
 class UrlBar;
 class VrBrowserInterface;
 
 class UiSceneManager {
  public:
   UiSceneManager(VrBrowserInterface* browser,
                  UiScene* scene,
                  bool in_cct,
                  bool in_web_vr);
   ~UiSceneManager();
 
   base::WeakPtr<UiSceneManager> GetWeakPtr();
 
   void SetFullscreen(bool fullscreen);
   void SetURL(const GURL& gurl);
   void SetWebVrSecureOrigin(bool secure);
   void SetWebVrMode(bool web_vr);
   // These methods are currently stubbed.
   void SetSecurityLevel(int level);
   void SetLoading(bool loading);
-  void SetLoadProgress(double progress);
+  void SetLoadProgress(float progress);
   void SetHistoryButtonsEnabled(bool can_go_back, bool can_go_forward);
 
   void OnAppButtonClicked();
   void OnAppButtonGesturePerformed(UiInterface::Direction direction);
 
  private:
   void CreateSecurityWarnings();
   void CreateContentQuad();
   void CreateBackground();
   void CreateUrlBar();
 
+  void ConfigureScene();
   void ConfigureSecurityWarnings();
   void OnSecurityWarningTimer();
   void OnBackButtonClicked();
   int AllocateId();
 
   VrBrowserInterface* browser_;
   UiScene* scene_;
 
   // UI element pointers (not owned by the scene manager).
   UiElement* permanent_security_warning_ = nullptr;
   UiElement* transient_security_warning_ = nullptr;
   UiElement* main_content_ = nullptr;
   UrlBar* url_bar_ = nullptr;
+  LoadingIndicator* loading_indicator_ = nullptr;
 
   bool in_cct_;
   bool web_vr_mode_;
   bool secure_origin_ = false;
   bool content_rendering_enabled_ = true;
 
   int next_available_id_ = 1;
 
   std::vector<UiElement*> browser_ui_elements_;
 
   base::OneShotTimer security_warning_timer_;
 
   base::WeakPtrFactory<UiSceneManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UiSceneManager);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_SCENE_MANAGER_H_