Add gfx_unittests to trybot list for mac and windows.

BUG=331829, 299841

Review URL: https://codereview.chromium.org/178153005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253820 0039d316-1c4b-4281-b951-d872f2087c98

PRESUBMIT.py

@@ -1228,7 +1228,6 @@ def GetDefaultTryConfigs(bots=None):
       'content_browsertests',
       'content_unittests',
       'crypto_unittests',
-      #'gfx_unittests',
       'gpu_unittests',
       'interactive_ui_tests',
       'ipc_tests',
@@ -1315,6 +1314,7 @@ def GetDefaultTryConfigs(bots=None):
           'cc_unittests',
           'chromedriver_unittests',
           'components_unittests',
+          'gfx_unittests',
           'google_apis_unittests',
           'message_center_unittests',
           'nacl_integration',
@@ -1335,6 +1335,7 @@ def GetDefaultTryConfigs(bots=None):
           'components_unittests',
           'compositor_unittests',
           'events_unittests',
+          'gfx_unittests',
           'google_apis_unittests',
           'installer_util_unittests',
           'mini_installer_test',