Post the task of disabling virtual keyboard

ash/system/ime_menu/ime_menu_tray.cc

 // Copyright 2016 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_menu/ime_menu_tray.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/ash_constants.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/resources/grit/ash_resources.h"
@@ skipping 269 matching lines @@
 };
 
 }  // namespace
 
 ImeMenuTray::ImeMenuTray(WmShelf* wm_shelf)
     : TrayBackgroundView(wm_shelf),
       label_(new ImeMenuLabel()),
       show_keyboard_(false),
       force_show_keyboard_(false),
       keyboard_suppressed_(false),
-      show_bubble_after_keyboard_hidden_(false) {
+      show_bubble_after_keyboard_hidden_(false),
+      weak_ptr_factory_(this) {
   SetInkDropMode(InkDropMode::ON);
   SetupLabelForTray(label_);
   label_->SetElideBehavior(gfx::TRUNCATE);
   tray_container()->AddChildView(label_);
   SystemTrayNotifier* tray_notifier = Shell::Get()->system_tray_notifier();
   tray_notifier->AddIMEObserver(this);
   tray_notifier->AddVirtualKeyboardObserver(this);
 }
 
 ImeMenuTray::~ImeMenuTray() {
@@ skipping 223 matching lines @@
   // If the keyboard is forced to be shown by IME menu for once, we need to
   // disable the keyboard when it's hidden.
   keyboard::KeyboardController* keyboard_controller =
       keyboard::KeyboardController::GetInstance();
   if (keyboard_controller)
     keyboard_controller->RemoveObserver(this);
 
   if (!force_show_keyboard_)
     return;
 
-  Shell::Get()->accessibility_delegate()->SetVirtualKeyboardEnabled(false);
-  force_show_keyboard_ = false;
+  // Posts a task to disable the virtual keyboard.
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(&ImeMenuTray::DisableVirtualKeyboard,
+                            weak_ptr_factory_.GetWeakPtr()));
 }
 
 void ImeMenuTray::OnKeyboardSuppressionChanged(bool suppressed) {
   if (suppressed != keyboard_suppressed_ && bubble_)
     HideImeMenuBubble();
   keyboard_suppressed_ = suppressed;
 }
 
 void ImeMenuTray::UpdateTrayLabel() {
   Shell::Get()->system_tray_delegate()->GetCurrentIME(&current_ime_);
 
   // Updates the tray label based on the current input method.
   if (current_ime_.third_party)
     label_->SetText(current_ime_.short_name + base::UTF8ToUTF16("*"));
   else
     label_->SetText(current_ime_.short_name);
 }
 
+void ImeMenuTray::DisableVirtualKeyboard() {
+  Shell::Get()->accessibility_delegate()->SetVirtualKeyboardEnabled(false);
+  force_show_keyboard_ = false;
+}
+
 }  // namespace ash