Skeleton for app_list on OSX, and refactoring for enable_app_list=1 on OS=="mac".

chrome/chrome_tests.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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1154 matching lines @@
         'browser/tab_contents/render_view_context_menu_browsertest_util.cc',
         'browser/tab_contents/render_view_context_menu_browsertest_util.h',
         'browser/tab_contents/spellchecker_submenu_observer_browsertest.cc',
         'browser/tab_contents/spelling_menu_observer_browsertest.cc',
         'browser/tab_contents/view_source_browsertest.cc',
         'browser/task_manager/task_manager_browsertest.cc',
         'browser/task_manager/task_manager_browsertest_util.cc',
         'browser/task_manager/task_manager_browsertest_util.h',
         'browser/task_manager/task_manager_notification_browsertest.cc',
         'browser/translate/translate_manager_browsertest.cc',
+        'browser/ui/app_list/app_list_controller_browsertest.cc',
         'browser/ui/ash/caps_lock_handler_browsertest.cc',
         'browser/ui/ash/chrome_shell_delegate_browsertest.cc',
         'browser/ui/ash/launcher/chrome_launcher_controller_browsertest.cc',
         'browser/ui/ash/launcher/launcher_favicon_loader_browsertest.cc',
         'browser/ui/ash/shelf_browsertest.cc',
         'browser/ui/ash/volume_controller_browsertest_chromeos.cc',
         'browser/ui/bookmarks/bookmark_browsertest.cc',
         'browser/ui/browser_browsertest.cc',
         'browser/ui/browser_close_browsertest.cc',
         'browser/ui/browser_command_controller_browsertest.cc',
@@ skipping 434 matching lines @@
             ['exclude', '^browser/ui/views/'],
           ],
         }],
         ['target_arch!="arm"', {
           'dependencies': [
             # build time dependency.
             '../v8/tools/gyp/v8.gyp:v8_shell#host',
             '../webkit/webkit.gyp:copy_npapi_test_plugin',
           ],
         }],
+        ['enable_app_list==0', {
+          'sources/': [
+            ['exclude', '^browser/ui/app_list/'],
+          ],
+        }],
       ],  # conditions
     },  # target browser_tests
     {
       # Executable that runs each perf browser test in a new process.
       'target_name': 'performance_browser_tests',
       'type': 'executable',
       'msvs_cygwin_shell': 0,
       'msvs_cygwin_dirs': ['<(DEPTH)/third_party/cygwin'],
       'dependencies': [
         'browser',
@@ skipping 1218 matching lines @@
             'sync_integration_tests.isolate',
           ],
           'sources': [
             'sync_integration_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }