Post the task of disabling virtual keyboard

ash/system/ime_menu/ime_menu_tray_unittest.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/accelerators/accelerator_controller.h"
 #include "ash/accessibility_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/ime_menu/ime_list_view.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/ime_info.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/status_area_widget_test_helper.h"
 #include "ash/test/test_system_tray_delegate.h"
+#include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
 #include "ui/base/ime/chromeos/mock_input_method_manager.h"
 #include "ui/base/ime/ime_bridge.h"
 #include "ui/base/ime/text_input_flags.h"
 #include "ui/events/event.h"
 #include "ui/views/controls/label.h"
 
 using base::UTF8ToUTF16;
@@ skipping 263 matching lines @@
       Shell::Get()->accessibility_delegate();
   accessibility_delegate->SetVirtualKeyboardEnabled(false);
   ASSERT_FALSE(accessibility_delegate->IsVirtualKeyboardEnabled());
 
   GetTray()->ShowKeyboardWithKeyset("emoji");
   // The virtual keyboard should be enabled.
   EXPECT_TRUE(accessibility_delegate->IsVirtualKeyboardEnabled());
 
   // Hides the keyboard.
   GetTray()->OnKeyboardHidden();
-  // The keyboard should still be disabled.
+  // The keyboard should still be disabled, which is a posted task.
+  base::RunLoop().RunUntilIdle();
   EXPECT_FALSE(accessibility_delegate->IsVirtualKeyboardEnabled());
 }
 
 TEST_F(ImeMenuTrayTest, ShowEmojiHandwritingVoiceButtons) {
   FocusInInputContext(ui::TEXT_INPUT_TYPE_TEXT);
   EXPECT_FALSE(GetTray()->ShouldShowEmojiHandwritingVoiceButtons());
 
   chromeos::input_method::InputMethodManager* input_method_manager =
       chromeos::input_method::InputMethodManager::Get();
   EXPECT_FALSE(input_method_manager);
   chromeos::input_method::InputMethodManager::Initialize(
       new chromeos::input_method::MockInputMethodManager);
   input_method_manager = chromeos::input_method::InputMethodManager::Get();
   EXPECT_TRUE(input_method_manager &&
               input_method_manager->IsEmojiHandwritingVoiceOnImeMenuEnabled());
   EXPECT_TRUE(GetTray()->ShouldShowEmojiHandwritingVoiceButtons());
 
   FocusInInputContext(ui::TEXT_INPUT_TYPE_PASSWORD);
   EXPECT_FALSE(GetTray()->ShouldShowEmojiHandwritingVoiceButtons());
 }
 
 }  // namespace ash