Get drag and drop working on Win Ash.

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',
   },
   'includes': [
@@ skipping 605 matching lines @@
         '<(SHARED_INTERMEDIATE_DIR)/ash/ash_resources/ash_wallpaper_resources.rc',
       ],
       'conditions': [
         ['use_ibus==1', {
           'dependencies': [
             '../build/linux/system.gyp:ibus',
           ],
         }],
         ['OS=="win"', {
           'sources/': [
-            # TODO(win_ash): implement DragDropController::StartDragAndDrop
-            ['exclude', 'drag_drop/drag_drop_controller_unittest.cc'],
           # TODO(zork): fix this test to build on Windows. See: crosbug.com/26906
             ['exclude', 'focus_cycler_unittest.cc'],
             # All tests for multiple displays: not supported on Windows Ash.
             ['exclude', 'wm/drag_window_resizer_unittest.cc'],
           ],
         }],
         ['OS=="mac"', {
           'sources/': [
             ['exclude', 'accelerators/accelerator_controller_unittest.cc'],
             ['exclude', 'accelerators/accelerator_filter_unittest.cc'],
@@ skipping 101 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }