Do not change IME label in tray before hiding it.

ash/system/ime/tray_ime.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 "ash/system/ime/tray_ime.h"
 
 #include <vector>
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/root_window_controller.h"
@@ skipping 185 matching lines @@
 }
 
 TrayIME::~TrayIME() {
   Shell::GetInstance()->system_tray_notifier()->RemoveIMEObserver(this);
   message_center::MessageCenter::Get()->RemoveNotification(
       kIMENotificationId, false /* by_user */);
 }
 
 void TrayIME::UpdateTrayLabel(const IMEInfo& current, size_t count) {
   if (tray_label_) {
+    bool visible = count > 1;
+    tray_label_->SetVisible(visible);
+    // Do not change label before hiding because this change is noticeable.
+    if (!visible)
+      return;
     if (current.third_party) {
       tray_label_->label()->SetText(
           current.short_name + base::UTF8ToUTF16("*"));
     } else {
       tray_label_->label()->SetText(current.short_name);
     }
-    tray_label_->SetVisible(count > 1);
     SetTrayLabelItemBorder(tray_label_, system_tray()->shelf_alignment());
     tray_label_->Layout();
   }
 }
 
 void TrayIME::UpdateOrCreateNotification() {
   message_center::MessageCenter* message_center =
       message_center::MessageCenter::Get();
 
   if (!message_center->HasNotification(kIMENotificationId) && message_shown_)
@@ skipping 91 matching lines @@
     default_->UpdateLabel(current);
   if (detailed_)
     detailed_->Update(list, property_list);
 
   if (list.size() > 1 && show_message)
     UpdateOrCreateNotification();
 }
 
 }  // namespace internal
 }  // namespace ash