VR: Add a loading indicator to the scene.

chrome/browser/android/vr_shell/textures/ui_texture.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 26 matching lines @@
 
   UiTexture();
   virtual ~UiTexture();
 
   void DrawAndLayout(SkCanvas* canvas, const gfx::Size& texture_size);
   virtual gfx::Size GetPreferredTextureSize(int maximum_width) const = 0;
   virtual gfx::SizeF GetDrawnSize() const = 0;
   // Returns true if the state changed.
   virtual bool SetDrawFlags(int draw_flags);
   int GetDrawFlags() { return draw_flags_; }
+  bool dirty() const { return dirty_; }
 
  protected:
   virtual void Draw(SkCanvas* canvas, const gfx::Size& texture_size) = 0;
 
   // Prepares a set of RenderText objects with the given color and fonts.
   // Attempts to fit the text within the provided size. |flags| specifies how
   // the text should be rendered. If multiline is requested and provided height
   // is 0, it will be set to the minimum needed to fit the whole text. If
   // multiline is not requested and provided width is 0, it will be set to the
   // minimum needed to fit the whole text.
   static std::vector<std::unique_ptr<gfx::RenderText>> PrepareDrawStringRect(
       const base::string16& text,
       const gfx::FontList& font_list,
       SkColor color,
       gfx::Rect* bounds,
       int flags);
 
+  void set_dirty() { dirty_ = true; }
+
   static bool IsRTL();
   static gfx::FontList GetDefaultFontList(int size);
   static gfx::FontList GetFontList(int size, base::string16 text);
 
  private:
   int draw_flags_ = 0;
+  bool dirty_ = false;
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_