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

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,
     # Sources lists shared with GN build.
     'views_sources': [
       'accessibility/native_view_accessibility.cc',
       'accessibility/native_view_accessibility.h',
@@ skipping 604 matching lines @@
         '../compositor/compositor.gyp:compositor',
         '../events/events.gyp:events',
         '../events/events.gyp:events_base',
         '../events/platform/events_platform.gyp:events_platform',
         '../gfx/gfx.gyp:gfx',
         '../gfx/gfx.gyp:gfx_geometry',
         '../native_theme/native_theme.gyp:native_theme',
         '../resources/ui_resources.gyp:ui_resources',
         '../strings/ui_strings.gyp:ui_strings',
       ],
+      'all_dependent_settings': {
+        'defines': [
+          'TOOLKIT_VIEWS=1',
+        ],
+      },
       'export_dependent_settings': [
         '../accessibility/accessibility.gyp:ax_gen',
       ],
       'defines': [
         'VIEWS_IMPLEMENTATION',
       ],
       'sources': [
         '<@(views_sources)',
       ],
       'conditions': [
@@ skipping 297 matching lines @@
                 '../aura/aura.gyp:aura',
                 '../wm/wm.gyp:wm',
               ],
             }],
           ],
         },  # target_name: macviews_interactive_ui_tests
       ],  # targets
     }],
   ],  # conditions
 }