Validate that ui::Event::time_stamp comes from the same clock as TimeTicks::Now

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 24eb8bde75bfe042cad79c4c2737a829e0f117fd..bb5ab806a4f59b6b1fa947d820883a1561afc10a 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -1930,7 +1930,8 @@ void Textfield::UpdateContextMenu() {
 void Textfield::TrackMouseClicks(const ui::MouseEvent& event) {
   if (event.IsOnlyLeftMouseButton()) {
     base::TimeDelta time_delta = event.time_stamp() - last_click_time_;
-    if (time_delta.InMilliseconds() <= GetDoubleClickInterval() &&
+    if (!last_click_time_.is_null() &&
+        time_delta.InMilliseconds() <= GetDoubleClickInterval() &&
         !ExceededDragThreshold(event.location() - last_click_location_)) {
       // Upon clicking after a triple click, the count should go back to double
       // click and alternate between double and triple. This assignment maps