Work on GN build, mostly in //ui

ui/aura/aura.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': [
     {
+      # GN version: //ui/aura
       'target_name': 'aura',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../skia/skia.gyp:skia',
         '../base/ui_base.gyp:ui_base',
         '../compositor/compositor.gyp:compositor',
         '../events/events.gyp:events',
@@ skipping 111 matching lines @@
         ['use_ozone==1', {
           'dependencies': [
             '../events/ozone/events_ozone.gyp:events_ozone',
             '../ozone/ozone.gyp:ozone',
             '../ozone/ozone.gyp:ozone_base',
           ],
         }],
       ],
     },
     {
+      # GN version: //ui/aura:test_support
       'target_name': 'aura_test_support',
       'type': 'static_library',
       'dependencies': [
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../base/ui_base.gyp:ui_base',
         '../base/ui_base.gyp:ui_base_test_support',
         '../compositor/compositor.gyp:compositor_test_support',
         '../events/events.gyp:events',
         '../events/events.gyp:events_base',
@@ skipping 144 matching lines @@
         ['OS=="linux" and use_allocator!="none"', {
           'dependencies': [
            # See http://crbug.com/162998#c4 for why this is needed.
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ],
 }