Add tests for drag and drop for Linux Aura

ui/views/views.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,
   },
   'target_defaults': {
     'conditions': [
       ['use_aura==1', {
@@ skipping 635 matching lines @@
         'focus/focus_traversal_unittest.cc',
         'ime/input_method_bridge_unittest.cc',
         'layout/box_layout_unittest.cc',
         'layout/grid_layout_unittest.cc',
         'rect_based_targeting_utils_unittest.cc',
         'run_all_unittests.cc',
         'touchui/touch_selection_controller_impl_unittest.cc',
         'view_model_unittest.cc',
         'view_model_utils_unittest.cc',
         'view_unittest.cc',
+        'widget/desktop_aura/desktop_drag_drop_client_aurax11_unittest.cc',
         'widget/desktop_aura/desktop_focus_rules_unittest.cc',
         'widget/desktop_aura/desktop_native_widget_aura_unittest.cc',
         'widget/desktop_aura/desktop_window_tree_host_win_unittest.cc',
         'widget/desktop_aura/desktop_screen_x11_unittest.cc',
         'widget/desktop_aura/desktop_screen_position_client_unittest.cc',
         'widget/native_widget_aura_unittest.cc',
         'widget/native_widget_unittest.cc',
         'widget/root_view_unittest.cc',
         'widget/widget_unittest.cc',
         'widget/window_reorderer_unittest.cc',
@@ skipping 49 matching lines @@
         }],
         ['use_aura==1', {
           'dependencies': [
             '../aura/aura.gyp:aura_test_support',
           ],
         }],
       ],
     },  # target_name: views_unittests
   ],
 }