[VR Shell] Fix hidden elements being hit-testable.

chrome/browser/resources/vr_shell/vr_shell_ui_api.js

Index: chrome/browser/resources/vr_shell/vr_shell_ui_api.js
diff --git a/chrome/browser/resources/vr_shell/vr_shell_ui_api.js b/chrome/browser/resources/vr_shell/vr_shell_ui_api.js
index 48d2f26cba93a84bfa47e0c88664d8208c036dee..5090f826ec129442acbb690a1964e53bf8de8fe5 100644
--- a/chrome/browser/resources/vr_shell/vr_shell_ui_api.js
+++ b/chrome/browser/resources/vr_shell/vr_shell_ui_api.js
@@ -140,6 +140,12 @@ api.Fill = class {
   }
 }
 
+api.NoFill = class extends api.Fill {
+  constructor() {
+    super(api.FillType.NONE);
+  }
+}
+
 api.Sprite = class extends api.Fill {
   constructor(pixelX, pixelY, pixelWidth, pixelHeight) {
     super(api.FillType.SPRITE);