SearchBoxView now enables/disables cursor based on user interaction.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index 7e9dbae11d8d961b29cab6b5deea857572a2bc70..5901ccbef5223c590c71c8a1196840e69048a865 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -696,6 +696,8 @@ void Textfield::OnGestureEvent(ui::GestureEvent* event) {
       event->SetHandled();
       break;
     case ui::ET_GESTURE_TAP:
+      DCHECK(controller_);
+      controller_->NotifyOfGestureEvent();
       if (event->details().tap_count() == 1) {
         // If tap is on the selection and touch handles are not present, handles
         // should be shown without changing selection. Otherwise, cursor should