Make InputMethodEngine manage its descriptor.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 55 matching lines @@
         'browser/browsing_data/mock_browsing_data_local_storage_helper.cc',
         'browser/browsing_data/mock_browsing_data_local_storage_helper.h',
         'browser/browsing_data/mock_browsing_data_quota_helper.cc',
         'browser/browsing_data/mock_browsing_data_quota_helper.h',
         'browser/browsing_data/mock_browsing_data_server_bound_cert_helper.cc',
         'browser/browsing_data/mock_browsing_data_server_bound_cert_helper.h',
         'browser/chromeos/contacts/contact_test_util.cc',
         'browser/chromeos/contacts/contact_test_util.h',
         'browser/chromeos/input_method/mock_candidate_window_controller.cc',
         'browser/chromeos/input_method/mock_candidate_window_controller.h',
+        'browser/chromeos/input_method/mock_input_method_engine.cc',
+        'browser/chromeos/input_method/mock_input_method_engine.h',
         'browser/chromeos/input_method/mock_input_method_manager.cc',
         'browser/chromeos/input_method/mock_input_method_manager.h',
         'browser/chromeos/login/fake_login_utils.cc',
         'browser/chromeos/login/fake_login_utils.h',
         'browser/chromeos/login/fake_supervised_user_manager.cc',
         'browser/chromeos/login/fake_supervised_user_manager.h',
         'browser/chromeos/login/fake_user_manager.cc',
         'browser/chromeos/login/fake_user_manager.h',
         'browser/chromeos/login/mock_authenticator.cc',
         'browser/chromeos/login/mock_authenticator.h',
@@ skipping 2794 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }