First shot at implementing drag&drop for Aura

ui/ui.gyp

 # Copyright (c) 2011 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,
   },
   'target_defaults': {
     'conditions': [
@@ skipping 74 matching lines @@
         'base/dragdrop/drag_drop_types_win.cc',
         'base/dragdrop/drag_source.cc',
         'base/dragdrop/drag_source.h',
         'base/dragdrop/drop_target.cc',
         'base/dragdrop/drop_target.h',
         'base/dragdrop/gtk_dnd_util.cc',
         'base/dragdrop/gtk_dnd_util.h',
         'base/dragdrop/os_exchange_data.cc',
         'base/dragdrop/os_exchange_data.h',
         'base/dragdrop/os_exchange_data_provider_aura.cc',
+        'base/dragdrop/os_exchange_data_provider_aura.h',
         'base/dragdrop/os_exchange_data_provider_gtk.cc',
         'base/dragdrop/os_exchange_data_provider_gtk.h',
         'base/dragdrop/os_exchange_data_provider_win.cc',
         'base/dragdrop/os_exchange_data_provider_win.h',
         'base/events.h',
         'base/gtk/event_synthesis_gtk.cc',
         'base/gtk/event_synthesis_gtk.h',
         'base/gtk/g_object_destructor_filo.cc',
         'base/gtk/g_object_destructor_filo.h',
         'base/gtk/gtk_expanded_container.cc',
@@ skipping 225 matching lines @@
            ],
         }, {  # use_aura!=1
           'sources!': [
             'gfx/native_theme_aura.cc',
             'gfx/native_theme_aura.h',
           ]
         }],
         ['use_aura==1 and OS=="win"', {
           'sources/': [
             ['exclude', 'base/dragdrop/os_exchange_data_provider_aura.cc'],
+            ['exclude', 'base/dragdrop/os_exchange_data_provider_aura.h'],
             ['exclude', 'gfx/native_theme_win.cc'],
             ['exclude', 'gfx/native_theme_win.h'],
             ['exclude', 'gfx/path_win.cc'],
           ],
         }],
         ['use_glib == 1', {
           'dependencies': [
             # font_gtk.cc uses fontconfig.
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:glib',
@@ skipping 257 matching lines @@
                 'shutil.copyfile(\'<(ui_copy_target)\', \'<(ui_copy_dest)\'); ' \
                 'os.chmod(\'<(ui_copy_dest)\', 0700)'
               ]
             }
           ],
         },
       ],
     }],
   ],
 }