VR: Add initial URL bar element and texture.

chrome/browser/android/vr_shell/ui_elements/textured_element.h

Index: chrome/browser/android/vr_shell/ui_elements/textured_element.h
diff --git a/chrome/browser/android/vr_shell/ui_elements/textured_element.h b/chrome/browser/android/vr_shell/ui_elements/textured_element.h
index e6cc7f73e7523b01fd20eafe61b8c6bbfac30b6d..d2858f33b2f9363886b2114a7e1d8dea2fed8e77 100644
--- a/chrome/browser/android/vr_shell/ui_elements/textured_element.h
+++ b/chrome/browser/android/vr_shell/ui_elements/textured_element.h
@@ -23,14 +23,15 @@ class TexturedElement : public UiElement {
   explicit TexturedElement(int maximum_width);
   ~TexturedElement() override;
 
-  void Initialize() override;
+  void Initialize() final;
 
   // UiElement interface.
   void Render(VrShellRenderer* renderer,
-              vr::Mat4f view_proj_matrix) const override;
+              vr::Mat4f view_proj_matrix) const final;
 
  protected:
   virtual UiTexture* GetTexture() const = 0;
+  void Update();
 
  private:
   void Flush(SkSurface* surface);