Update fullscreen ux, make floor and ceiling visible.

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"
@@ skipping 48 matching lines @@
   void OnCloseButtonClicked();
   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;
+  UiElement* ceiling_ = nullptr;

[cjgrant, 2017/05/18 16:07:16]

It really is looking like scene manager should own elements now that it's
native.  Thinking about this for future cleanup...

[amp, 2017/05/18 16:15:33]

I threw this together to get it working quickly in case branch point came at me
quicker than expected, but I still have it in mind set up enums for each element
(as we discussed for testing) and use those instead of hardcoding in elements in
here.

If I have time I want to finish off the tests with the new enum and then rework
this to use those.

As I'm out tomorrow for our move in KIR (our desktops will be off so I can't
even WFH) time will be a little bit tighter, but maybe still doable before
branch point next Thur.

+  UiElement* floor_ = nullptr;
+  UiElement* floor_grid_ = nullptr;
   UiElement* audio_input_indicator_ = nullptr;
   UiElement* video_input_indicator_ = nullptr;
   UrlBar* url_bar_ = nullptr;
   LoadingIndicator* loading_indicator_ = nullptr;
 
   bool in_cct_;
   bool web_vr_mode_;
   bool secure_origin_ = false;
   bool fullscreen_ = false;
 
   int next_available_id_ = 1;
 
   std::vector<UiElement*> content_elements_;
   std::vector<UiElement*> control_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_