[vr] Ensure that textured elements never draw with a dirty 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 f3e1411f5d7a4a7cc2c159b261738ff3308e24d2..3c009a029e67eafd7c1afdd97c170ba17ba1018e 100644
--- a/chrome/browser/android/vr_shell/ui_elements/textured_element.h
+++ b/chrome/browser/android/vr_shell/ui_elements/textured_element.h
@@ -30,6 +30,8 @@ class TexturedElement : public UiElement {
   void Render(UiElementRenderer* renderer,
               gfx::Transform view_proj_matrix) const final;
 
+  void OnBeginFrame(const base::TimeTicks& begin_frame_time) override;
+
  protected:
   virtual UiTexture* GetTexture() const = 0;
   virtual void UpdateTexture();