Restructure the events target into two components:

ui/ui.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,
   },
   'includes': [
     'ui_resources.gypi',
   ],
   'targets': [
     {
       'target_name': 'ui',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
         '../base/base.gyp:base_static',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../net/net.gyp:net',
         '../skia/skia.gyp:skia',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/libpng/libpng.gyp:libpng',
         '../third_party/zlib/zlib.gyp:zlib',
         '../url/url.gyp:url_lib',
         'base/strings/ui_strings.gyp:ui_strings',
-        'events/events.gyp:events',
+        'events/events.gyp:events_base',
         'gfx/gfx.gyp:gfx',
         'ui_resources',
       ],
       'defines': [
         'UI_IMPLEMENTATION',
       ],
-      # Export these dependencies since text_elider.h includes ICU headers.
       'export_dependent_settings': [
         '../net/net.gyp:net',
-        '../third_party/icu/icu.gyp:icui18n',
-        '../third_party/icu/icu.gyp:icuuc',
-        'events/events.gyp:events',
         'gfx/gfx.gyp:gfx',
       ],
       'sources' : [
         'base/accelerators/accelerator.cc',
         'base/accelerators/accelerator.h',
         'base/accelerators/accelerator_manager.cc',
         'base/accelerators/accelerator_manager.h',
         'base/accelerators/menu_label_accelerator_util_linux.cc',
         'base/accelerators/menu_label_accelerator_util_linux.h',
         'base/accelerators/platform_accelerator.h',
@@ skipping 292 matching lines @@
             ['include', '^base/layout'],
             ['include', '^base/resource/'],
             ['include', '^base/ui_base_'],
           ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/CoreGraphics.framework',
             ],
           },
         }],
+        ['toolkit_views==1', {
+          'dependencies': [
+            'events/events.gyp:events',
+          ],
+        }],
         ['use_aura==1', {
           'sources/': [
             ['exclude', 'base/work_area_watcher_observer.h'],
             ['exclude', 'base/x/active_window_watcher_x.cc'],
             ['exclude', 'base/x/active_window_watcher_x.h'],
             ['exclude', 'base/x/active_window_watcher_x_observer.h'],
             ['exclude', 'base/x/root_window_property_watcher_x.cc'],
             ['exclude', 'base/x/root_window_property_watcher_x.h'],
             ['exclude', 'base/x/work_area_watcher_x.cc'],
             ['exclude', 'base/x/work_area_watcher_x.h'],
@@ skipping 356 matching lines @@
               'xcode_settings': {
                 'GCC_SYMBOLS_PRIVATE_EXTERN': 'NO',
               },
             }],
           ],
         },
       ],
     }],
   ],
 }