VR: Route hover and click events to UI elements.

chrome/browser/android/vr_shell/ui_elements/ui_element.cc

Index: chrome/browser/android/vr_shell/ui_elements/ui_element.cc
diff --git a/chrome/browser/android/vr_shell/ui_elements/ui_element.cc b/chrome/browser/android/vr_shell/ui_elements/ui_element.cc
index 42d4c37ea022a8ddd8564144e7dcb22fe4501fa0..3fb8486cd344ba14e4091990330366db5181e9e8 100644
--- a/chrome/browser/android/vr_shell/ui_elements/ui_element.cc
+++ b/chrome/browser/android/vr_shell/ui_elements/ui_element.cc
@@ -112,6 +112,12 @@ void UiElement::Render(VrShellRenderer* renderer,
 
 void UiElement::Initialize() {}
 
+void UiElement::OnMouseEnter() {}
+
+void UiElement::OnMouseLeave() {}
+
+void UiElement::OnClick() {}
+
 void UiElement::Animate(const base::TimeTicks& time) {
   for (auto& it : animations) {
     Animation& animation = *it;