Enable dragging of images to desktop (Finder), Preview, etc. (on Mac)....

chrome/chrome.gyp

 # 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': {
     'chromium_code': 1,
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 751 matching lines @@
         'browser/cocoa/bookmark_name_folder_controller.mm',
         'browser/cocoa/browser_test_helper.h',
         'browser/cocoa/browser_window.h',
         'browser/cocoa/browser_window.mm',
         'browser/cocoa/browser_window_cocoa.h',
         'browser/cocoa/browser_window_cocoa.mm',
         'browser/cocoa/browser_window_controller.h',
         'browser/cocoa/browser_window_controller.mm',
         'browser/cocoa/clear_browsing_data_controller.h',
         'browser/cocoa/clear_browsing_data_controller.mm',
+        'browser/cocoa/clickhold_button_cell.h',
+        'browser/cocoa/clickhold_button_cell.mm',
         'browser/cocoa/cocoa_test_helper.h',
         'browser/cocoa/command_observer_bridge.h',
         'browser/cocoa/command_observer_bridge.mm',
         'browser/cocoa/custom_home_pages_model.h',
         'browser/cocoa/custom_home_pages_model.mm',
+        'browser/cocoa/delayedlist_button.h',
+        'browser/cocoa/delayedlist_button.mm',
         'browser/cocoa/download_item_cell.h',
         'browser/cocoa/download_item_cell.mm',
         'browser/cocoa/download_item_controller.h',
         'browser/cocoa/download_item_controller.mm',
         'browser/cocoa/download_item_mac.h',
         'browser/cocoa/download_item_mac.mm',
         'browser/cocoa/download_shelf_controller.h',
         'browser/cocoa/download_shelf_controller.mm',
         'browser/cocoa/download_shelf_mac.h',
         'browser/cocoa/download_shelf_mac.mm',
@@ skipping 69 matching lines @@
         'browser/cocoa/throbber_view.h',
         'browser/cocoa/throbber_view.mm',
         'browser/cocoa/toolbar_button_cell.h',
         'browser/cocoa/toolbar_button_cell.mm',
         'browser/cocoa/toolbar_controller.h',
         'browser/cocoa/toolbar_controller.mm',
         'browser/cocoa/toolbar_view.h',
         'browser/cocoa/toolbar_view.mm',
         'browser/cocoa/ui_localizer.h',
         'browser/cocoa/ui_localizer.mm',
+        'browser/cocoa/web_drag_source.h',
+        'browser/cocoa/web_drag_source.mm',
         'browser/cocoa/web_drop_target.h',
         'browser/cocoa/web_drop_target.mm',
         'browser/command_updater.cc',
         'browser/command_updater.h',
         'browser/cookies_table_model.cc',
         'browser/cookies_table_model.h',
         'browser/cross_site_request_manager.cc',
         'browser/cross_site_request_manager.h',
         'browser/defaults.cc',
         'browser/defaults.h',
@@ skipping 4286 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }