VR Shell: Allow UI elements to determine hit testing.

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 330416e9ba444bf95fd6f21c7a2db4d7fdd99ee3..d47bf5e6250842de984dd2632e2717dd7db3f2bb 100644
--- a/chrome/browser/android/vr_shell/ui_elements/ui_element.cc
+++ b/chrome/browser/android/vr_shell/ui_elements/ui_element.cc
@@ -226,4 +226,9 @@ void UiElement::SetEnabled(bool enabled) {
   visible_ = enabled;
 }
 
+bool UiElement::HitTest(gfx::PointF point) const {
+  return point.x() >= 0.0f && point.x() <= 1.0f && point.y() >= 0.0f &&
+         point.y() <= 1.0f;
+}
+
 }  // namespace vr_shell