Make download items drag sources on OS X.

chrome/chrome_tests.gypi

 # Copyright (c) 2009 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' : {
     'browser_tests_sources_views_specific': [
       'browser/extensions/browser_action_test_util_views.cc',
       'browser/views/find_bar_host_browsertest.cc',
     ],
@@ skipping 584 matching lines @@
         'browser/cocoa/chrome_browser_window_unittest.mm',
         'browser/cocoa/chrome_event_processing_window_unittest.mm',
         'browser/cocoa/clear_browsing_data_controller_unittest.mm',
         'browser/cocoa/clickhold_button_cell_unittest.mm',
         'browser/cocoa/cocoa_test_helper.h',
         'browser/cocoa/cocoa_test_helper.mm',
         'browser/cocoa/command_observer_bridge_unittest.mm',
         'browser/cocoa/cookies_window_controller_unittest.mm',
         'browser/cocoa/custom_home_pages_model_unittest.mm',
         'browser/cocoa/delayedmenu_button_unittest.mm',
+        'browser/cocoa/download_item_button_unittest.mm',
         'browser/cocoa/download_shelf_mac_unittest.mm',
         'browser/cocoa/download_shelf_view_unittest.mm',
         'browser/cocoa/download_util_mac_unittest.mm',
+        'browser/cocoa/draggable_button_unittest.mm',
         'browser/cocoa/edit_search_engine_cocoa_controller_unittest.mm',
         'browser/cocoa/extensions/extension_popup_controller_unittest.mm',
         'browser/cocoa/event_utils_unittest.mm',
         'browser/cocoa/fast_resize_view_unittest.mm',
         'browser/cocoa/find_bar_bridge_unittest.mm',
         'browser/cocoa/find_bar_cocoa_controller_unittest.mm',
         'browser/cocoa/find_bar_text_field_unittest.mm',
         'browser/cocoa/find_bar_text_field_cell_unittest.mm',
         'browser/cocoa/find_bar_view_unittest.mm',
         'browser/cocoa/find_pasteboard_unittest.mm',
@@ skipping 1340 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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