Enable gpu rasterization in the vr shell

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 07e2eff2dfe9c43e36aa915777a32bffb26232e6..39cc9bd42c3cfd5630043cd7310b1cfe55de66ef 100644
--- a/chrome/browser/android/vr_shell/ui_scene.cc
+++ b/chrome/browser/android/vr_shell/ui_scene.cc
@@ -63,7 +63,7 @@ void UiScene::AddUiElement(std::unique_ptr<UiElement> element) {
     CHECK_EQ(element->y_anchoring(), YAnchoring::YNONE);
   }
   if (gl_initialized_)
-    element->Initialize();
+    element->Initialize(surface_provider_);
   ui_elements_.push_back(std::move(element));
 }
 
@@ -219,10 +219,11 @@ void UiScene::ApplyRecursiveTransforms(UiElement* element) {
 }
 
 // TODO(mthiesse): Move this to UiSceneManager.
-void UiScene::OnGLInitialized() {
+void UiScene::OnGLInitialized(VrSurfaceProvider* provider) {
   gl_initialized_ = true;
+  surface_provider_ = provider;
   for (auto& element : ui_elements_) {
-    element->Initialize();
+    element->Initialize(provider);
   }
 }