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..0c273d7af52f6ff4fc3c5dea6b2cce1d93cb3e00 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -696,6 +696,10 @@ void Textfield::OnGestureEvent(ui::GestureEvent* event) {
       event->SetHandled();
       break;
     case ui::ET_GESTURE_TAP:
+      if (controller_ && controller_->HandleGestureEvent(this, *event)) {
+        event->SetHandled();
+        return;
+      }
       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