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..0171e505cd854833796758bf52d7ac4f886853df 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 +112,14 @@ void UiElement::Render(VrShellRenderer* renderer,
 
 void UiElement::Initialize() {}
 
+void UiElement::OnHoverEnter() {}
+
+void UiElement::OnHoverLeave() {}
+
+void UiElement::OnButtonDown() {}
+
+void UiElement::OnButtonUp() {}
+
 void UiElement::Animate(const base::TimeTicks& time) {
   for (auto& it : animations) {
     Animation& animation = *it;