[zoom bubble] Add tests for ZoomController::UpdateState() handling empty hosts.

chrome/chrome_tests_unit.gypi

 # 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.
 {
   '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 1390 matching lines @@
         'browser/ui/webui/sync_internals_ui_unittest.cc',
         'browser/ui/webui/sync_setup_handler_unittest.cc',
         'browser/ui/webui/theme_source_unittest.cc',
         'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',
         'browser/ui/webui/web_ui_unittest.cc',
         'browser/ui/webui/web_ui_util_unittest.cc',
         'browser/ui/window_sizer/window_sizer_ash_unittest.cc',
         'browser/ui/window_sizer/window_sizer_common_unittest.cc',
         'browser/ui/window_sizer/window_sizer_unittest.cc',
         'browser/ui/window_snapshot/window_snapshot_mac_unittest.mm',
+        'browser/ui/zoom/zoom_controller_unittest.cc',
         'browser/chrome_to_mobile_service_unittest.cc',
         'browser/user_style_sheet_watcher_unittest.cc',
         'browser/value_store/leveldb_value_store_unittest.cc',
         'browser/value_store/policy_value_store_unittest.cc',
         'browser/value_store/testing_value_store_unittest.cc',
         'browser/value_store/value_store_change_unittest.cc',
         'browser/value_store/value_store_frontend_unittest.cc',
         'browser/value_store/value_store_unittest.cc',
         'browser/value_store/value_store_unittest.h',
         'browser/visitedlink/visitedlink_unittest.cc',
@@ skipping 843 matching lines @@
             'unit_tests.isolate',
           ],
           'sources': [
             'unit_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }