Aura/GTK integration: Create a small stub library that can talk to GTK.

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',
@@ skipping 459 matching lines @@
             ['exclude', 'base/native_theme/native_theme_win.cc'],
             ['exclude', 'base/native_theme/native_theme_win.h'],
             ['exclude', 'gfx/path_win.cc'],
           ],
         }],
         ['use_aura==0 and toolkit_views==0', {
           'sources/': [
             ['exclude', '^base/gestures/*'],
           ]
         }],
+        ['use_aura==1 and use_ash==0 and OS=="linux"', {
+          'sources': [
+            'base/linux_ui.cc',
+            'base/linux_ui.h',
+          ]
+        }],
         ['use_ibus==1', {
           'dependencies': [
             '../build/linux/system.gyp:ibus',
           ],
         }],
         ['use_glib == 1', {
           'dependencies': [
             # font_gtk.cc uses fontconfig.
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:glib',
@@ skipping 231 matching lines @@
                 'shutil.copyfile(\'<(ui_copy_target)\', \'<(ui_copy_dest)\'); ' \
                 'os.chmod(\'<(ui_copy_dest)\', 0700)'
               ]
             }
           ],
         },
       ],
     }],
   ],
 }