Hook up insecure content warnings for http webVR presentation.

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 9982c988caa67049f2618b565fb6d773284eb320..6a132e9a5fbc01f424615af227486806a70e2e21 100644
--- a/chrome/browser/android/vr_shell/ui_scene.cc
+++ b/chrome/browser/android/vr_shell/ui_scene.cc
@@ -62,6 +62,8 @@ void UiScene::AddUiElement(std::unique_ptr<UiElement> element) {
     CHECK_EQ(element->x_anchoring, XAnchoring::XNONE);
     CHECK_EQ(element->y_anchoring, YAnchoring::YNONE);
   }
+  if (gl_initialized_)
+    element->Initialize();
   ui_elements_.push_back(std::move(element));
 }
 
@@ -203,4 +205,12 @@ void UiScene::ApplyRecursiveTransforms(UiElement* element) {
   element->dirty = false;
 }
 
+// TODO(mthiesse): Move this to UiSceneManager.
+void UiScene::OnGLInitialized() {
+  gl_initialized_ = true;
+  for (const auto& element : ui_elements_) {
+    element->Initialize();
+  }
+}
+
 }  // namespace vr_shell