VrShell background implemented in JS.

chrome/browser/android/vr_shell/ui_elements.h

Index: chrome/browser/android/vr_shell/ui_elements.h
diff --git a/chrome/browser/android/vr_shell/ui_elements.h b/chrome/browser/android/vr_shell/ui_elements.h
index 42c349058508660b945750d247c88f5696d33354..14b5f8d0beada758e92850e13d01fc42799613ae 100644
--- a/chrome/browser/android/vr_shell/ui_elements.h
+++ b/chrome/browser/android/vr_shell/ui_elements.h
@@ -28,6 +28,13 @@ enum YAnchoring {
   YBOTTOM
 };
 
+enum Fill {
+  NONE = 0,
+  SPRITE = 1,
+  OPAQUE_GRADIENT = 2,
+  GRID_GRADIENT = 3
+};
+
 struct ReversibleTransform {
   ReversibleTransform();
 
@@ -72,7 +79,7 @@ struct ContentRectangle : public WorldRectangle {
   // Valid IDs are non-negative.
   int id = -1;
 
-  // If a non-negative parent ID is specified, applicable tranformations
+  // If a non-negative parent ID is specified, applicable transformations
   // are applied relative to the parent, rather than absolutely.
   int parent_id = -1;
 
@@ -121,6 +128,13 @@ struct ContentRectangle : public WorldRectangle {
   // Animations that affect the properties of the object over time.
   std::vector<std::unique_ptr<Animation>> animations;
 
+  Fill fill = Fill::NONE;
+
+  Colorf edge_color = {1.0f, 1.0f, 1.0f, 1.0f};
+  Colorf center_color = {1.0f, 1.0f, 1.0f, 1.0f};
+
+  unsigned int tile_number;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentRectangle);
 };