Fix browser_tests run isolated on OSX.

chrome/browser_tests.isolate

 # 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.
 {
   'includes': [
     'chrome.isolate',
   ],
   'conditions': [
     ['OS=="linux"', {
       'variables': {
@@ skipping 91 matching lines @@
           '<(PRODUCT_DIR)/lib64/',
           '<(PRODUCT_DIR)/plugins/',
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/clearkeycdmadapter.plugin',
           '<(PRODUCT_DIR)/libclearkeycdm.dylib',
+          '<(PRODUCT_DIR)/osmesa.so',
           '<(PRODUCT_DIR)/ppapi_nacl_tests_glibc_x32.nexe',
           '<(PRODUCT_DIR)/ppapi_nacl_tests_newlib_x32.nexe',
           '<(PRODUCT_DIR)/ppapi_nacl_tests_pnacl_newlib_x32.nexe',
           '<(PRODUCT_DIR)/ppapi_tests.plugin/Contents/MacOS/ppapi_tests',
         ],
         'isolate_dependency_untracked': [
           '<(PRODUCT_DIR)/lib32/',
           '<(PRODUCT_DIR)/plugins/npapi_test_plugin.plugin/',
           '<(PRODUCT_DIR)/plugins/test_netscape_plugin.plugin/',
         ],
@@ skipping 34 matching lines @@
     }],
     ['chromeos==1', {
       'variables': {
         'isolate_dependency_untracked': [
           '<(PRODUCT_DIR)/chromevox_test_data/',
         ],
       },
     }],
   ],
 }