Pepper3D test passes on trybots but fails on buildbots. I am guessing osmesa ...

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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' : {
     'pyautolib_sources': [
       'app/chrome_dll_resource.h',
       'common/pref_names.cc',
       'common/pref_names.h',
@@ skipping 327 matching lines @@
         'test/ui/sunspider_uitest.cc',
         'test/ui/v8_benchmark_uitest.cc',
         'worker/worker_uitest.cc',
       ],
       'conditions': [
         # http://code.google.com/p/chromium/issues/detail?id=18337
         ['target_arch!="x64" and target_arch!="arm"', {
           'dependencies': [
             '../webkit/webkit.gyp:npapi_test_plugin',
             '../webkit/webkit.gyp:npapi_pepper_test_plugin',
+            '../third_party/mesa/mesa.gyp:osmesa',
           ],
         }],
         ['OS=="linux"', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
           ],
         }, { # else: OS != "linux"
           'sources!': [
             'browser/process_singleton_linux_uitest.cc',
@@ skipping 2376 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: