Add switch to mash's browser_tests

testing/buildbot/gn_isolate_map.pyl

 ## Copyright 2015 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.
 
 # gn_isolate_map.pyl - A mapping of Ninja build target names to GN labels and
 # test type classifications for the tests that are run on the bots.
 #
 # This mapping is used by MB so that we can uniformly refer to test binaries
 # by their Ninja target names in the recipes and not need to worry about how
 # they are referred to in GN or GYP specifically (the GYP target name is pretty
@@ skipping 324 matching lines @@
   # See http://crbug.com/585151
   #"libphonenumber_unittests": {
     #"label": "//third_party/libphonenumber:libphonenumber_unittests",
     #"type": "console_test_launcher",
   #},
   "mash_browser_tests": {
     "label": "//chrome/test:mash_browser_tests",
     "label_type": "group",
     "type": "windowed_test_launcher",
     "executable": "browser_tests",
-    "args": ["--run-in-mash", "--test-launcher-filter-file=../../testing/buildbot/filters/mojo.fyi.browser_tests.filter"],
+    "args": ["--override-use-gl-with-osmesa-for-tests", "--run-in-mash", "--test-launcher-filter-file=../../testing/buildbot/filters/mojo.fyi.browser_tests.filter"],
   },
   "media_unittests": {
     "label": "//media:media_unittests",
     "type": "windowed_test_launcher",
   },
   "media_blink_unittests": {
     "label": "//media/blink:media_blink_unittests",
     "type": "windowed_test_launcher",
   },
   "midi_unittests": {
@@ skipping 217 matching lines @@
   },
   "wm_unittests": {
     "label": "//ui/wm:wm_unittests",
     "type": "windowed_test_launcher",
   },
   "wtf_unittests": {
     "label": "//third_party/WebKit/Source/wtf:wtf_unittests",
     "type": "console_test_launcher",
   },
 }