Support Drag and Drop across displays.

ash/ash.gyp

 # 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': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
 
@@ skipping 62 matching lines @@
         'display/multi_display_manager.cc',
         'display/multi_display_manager.h',
         'display/output_configurator_animation.cc',
         'display/output_configurator_animation.h',
         'display/screen_position_controller.cc',
         'display/screen_position_controller.h',
         'display/secondary_display_view.cc',
         'display/secondary_display_view.h',
         'drag_drop/drag_drop_controller.cc',
         'drag_drop/drag_drop_controller.h',
+        'drag_drop/drag_drop_tracker.cc',
+        'drag_drop/drag_drop_tracker.h',
         'drag_drop/drag_image_view.cc',
         'drag_drop/drag_image_view.h',
         'event_rewriter_delegate.h',
         'focus_cycler.cc',
         'focus_cycler.h',
         'high_contrast/high_contrast_controller.cc',
         'high_contrast/high_contrast_controller.h',
         'launcher/app_list_button.cc',
         'launcher/app_list_button.h',
         'launcher/background_animator.cc',
@@ skipping 510 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }