Fix Aura build when toolkit_views==0

ui/base/ui_base.gyp

 # Copyright 2014 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 371 matching lines @@
         }],
         ['desktop_linux == 1 or chromeos == 1', {
           'conditions': [
             ['toolkit_views==0 and use_aura==0', {
               # Note: because of gyp predence rules this has to be defined as
               # 'sources/' rather than 'sources!'.
               'sources/': [
                 ['exclude', '^dragdrop/drag_utils.cc'],
                 ['exclude', '^dragdrop/drag_utils.h'],
               ],
+            }, {
+              'sources/': [
+                ['include', '^dragdrop/os_exchange_data.cc'],
+                ['include', '^dragdrop/os_exchange_data.h'],
+                ['include', '^nine_image_painter_factory.cc'],
+                ['include', '^nine_image_painter_factory.h'],
+              ],
             }],
           ],
         }],
         ['use_pango==1', {
           'dependencies': [
             '../../build/linux/system.gyp:pangocairo',
           ],
         }],
         ['OS=="win" or use_clipboard_aurax11==1', {
           'sources!': [
@@ skipping 215 matching lines @@
            'variables': {
              'jni_gen_package': 'ui',
              'jni_generator_ptr_type': 'long',
            },
            'includes': [ '../../build/jni_generator.gypi' ],
          },
        ],
     }],
   ],
 }