SearchBoxView now enables/disables cursor based on user interaction.

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/textfield/textfield.h"
 
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 678 matching lines @@
 }
 
 void Textfield::OnGestureEvent(ui::GestureEvent* event) {
   switch (event->type()) {
     case ui::ET_GESTURE_TAP_DOWN:
       RequestFocus();
       ShowImeIfNeeded();
       event->SetHandled();
       break;
     case ui::ET_GESTURE_TAP:
+      DCHECK(controller_);
+      if (controller_->HandleGestureEvent(this, *event)) {

[oshima, 2017/06/29 16:58:50]

controller_ may be null, so just check like other places.

[newcomer, 2017/06/30 21:47:23]

Done.

+        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
         // be moved to the tap location.
         if (touch_selection_controller_ ||
             !GetRenderText()->IsPointInSelection(event->location())) {
           OnBeforeUserAction();
           MoveCursorTo(event->location(), false);
           OnAfterUserAction();
         }
@@ skipping 1411 matching lines @@
   cursor_blink_timer_.Stop();
 }
 
 void Textfield::OnCursorBlinkTimerFired() {
   DCHECK(ShouldBlinkCursor());
   cursor_view_.SetVisible(!cursor_view_.visible());
   UpdateCursorViewPosition();
 }
 
 }  // namespace views