PROTOTYPE (incomplete): Add quad renderer and stub bits to handle security warnings.

chrome/browser/android/vr_shell/ui_element.h

Index: chrome/browser/android/vr_shell/ui_element.h
diff --git a/chrome/browser/android/vr_shell/ui_element.h b/chrome/browser/android/vr_shell/ui_element.h
index 3f409743220d7dfe53623ae903adbe026b3b0e6f..95a146104e5668b8b59faaf85dbb3496fdd9065e 100644
--- a/chrome/browser/android/vr_shell/ui_element.h
+++ b/chrome/browser/android/vr_shell/ui_element.h
@@ -19,6 +19,7 @@ class TimeTicks;
 namespace vr_shell {
 
 class Animation;
+class VrShellRenderer;
 
 enum XAnchoring {
   XNONE = 0,
@@ -34,16 +35,15 @@ enum YAnchoring {
 
 enum Fill {
   NONE = 0,
-  SKIA = 1,
+  // The element is filled with the content web site. Only one content element
+  // may be added to the
+  // scene.
+  CONTENT = 1,
   // The element is filled with a radial gradient as specified by the edge and
   // center color.
   OPAQUE_GRADIENT = 2,
   // Same as OPAQUE_GRADIENT but the element is drawn as a grid.
   GRID_GRADIENT = 3,
-  // The element is filled with the content web site. Only one content element
-  // may be added to the
-  // scene.
-  CONTENT = 4,
 };
 
 struct Transform {
@@ -86,7 +86,7 @@ class WorldRectangle {
 
 struct UiElement : public WorldRectangle {
   UiElement();
-  ~UiElement();
+  virtual ~UiElement();
 
   void Animate(const base::TimeTicks& time);
 
@@ -96,6 +96,8 @@ struct UiElement : public WorldRectangle {
   // Indicates whether the element should be tested for cursor input.
   bool IsHitTestable() const;
 
+  virtual bool Render(VrShellRenderer* renderer) const;
+
   // Valid IDs are non-negative.
   int id = -1;