Add VR gradient and grid background to non-WebVR scene.

chrome/browser/android/vr_shell/ui_scene.cc

Index: chrome/browser/android/vr_shell/ui_scene.cc
diff --git a/chrome/browser/android/vr_shell/ui_scene.cc b/chrome/browser/android/vr_shell/ui_scene.cc
index 6744fe61a04f0dfc4465c20d992ad979fe459000..82984bb95adf91fac783b4d54b2c0c988c3b95bf 100644
--- a/chrome/browser/android/vr_shell/ui_scene.cc
+++ b/chrome/browser/android/vr_shell/ui_scene.cc
@@ -146,10 +146,18 @@ bool UiScene::HasVisibleHeadLockedElements() const {
   return !GetHeadLockedElements().empty();
 }
 
+void UiScene::SetBackgroundColor(const vr::Colorf& color) {
+  background_color_ = color;
+}
+
 const vr::Colorf& UiScene::GetBackgroundColor() const {
   return background_color_;
 }
 
+void UiScene::SetBackgroundDistance(float distance) {
+  background_distance_ = distance;
+}
+
 float UiScene::GetBackgroundDistance() const {
   return background_distance_;
 }