Revert of Revert of views: Move TOOLKIT_VIEWS definition in //ui/views/ from root.

ui/app_list/app_list.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,
   },
   'targets': [
     {
@@ skipping 177 matching lines @@
           'dependencies': [
             '../aura/aura.gyp:aura',
             '../wm/wm.gyp:wm',
           ],
         }],
         ['toolkit_views==1', {
           'dependencies': [
             '../events/events.gyp:events',
             '../views/views.gyp:views',
           ],
+          'export_dependent_settings': [
+              '../views/views.gyp:views',
+          ],
         }, {  # toolkit_views==0
           'sources/': [
             ['exclude', 'views/'],
           ],
         }],
         ['OS=="mac"', {
           'dependencies': [
             '../../third_party/google_toolbox_for_mac/google_toolbox_for_mac.gyp:google_toolbox_for_mac',
           ],
           'link_settings': {
@@ skipping 187 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }