aura: Set up the mock compositor to get gfx_unittests green on linux.

ui/ui_unittests.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'ui_test_support',
       'dependencies': [
         '../base/base.gyp:base',
@@ skipping 159 matching lines @@
           'sources': [
             'gfx/render_text_unittest.cc',
           ],
         }],
         ['use_aura==1 and OS!="win"', {
           'sources!': [
             # aura does not yet have clipboard support. http://crbug.com/97845
             'base/clipboard/clipboard_unittest.cc',
           ],
         }],
         ['use_aura==1', {

[Daniel Erat, 2011/10/27 16:05:26]

nit: delete this section

[sadrul, 2011/10/27 16:09:16]

I think we still need to disable the test for aura.

[Daniel Erat, 2011/10/27 16:10:23]

Sorry, I'm not sure how I misread this so horrendously.  Carry on. :-)

-          'dependencies': [
-            'aura/aura.gyp:aura',
+          'sources!': [
+            'gfx/screen_unittest.cc',
           ],
         }],
       ],
     },
   ],
 }