Add a new driver bug workaround SANDBOX_START_EARLY

gpu/config/gpu_driver_bug_list_json.cc

 // Copyright (c) 2013 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.
 
 // Determines whether a certain driver bug exists in the current system.
 // The format of a valid gpu_driver_bug_list.json file is defined in
 // <gpu/config/gpu_control_list_format.txt>.
 // The supported "features" can be found in
 // <gpu/config/gpu_driver_bug_workaround_type.h>.
 
@@ skipping 2009 matching lines @@
       "description": "Disable partial swaps on Mesa drivers (detected with GL_VERSION)",
       "cr_bugs": [339493],
       "os": {
         "type": "linux"
       },
       "gl_type": "gl",
       "gl_version_string": ".*Mesa.*",
       "features": [
         "disable_post_sub_buffers_for_onscreen_surfaces"
       ]
+    },
+    {
+      "id": 191,
+      "description": "The llvmpipe software driver from Mesa uses threads",
+      "cr_bugs": [264818],
+      "os": {
+        "type": "linux"
+      },
+      "gl_renderer": ".*Gallium.*llvmpipe.*",
+      "features": [
+        "sandbox_start_early"
+      ]
     }
   ]
   // Please update the version number at beginning of this file whenever you
   // change this file.
 }
 
 );  // LONG_STRING_CONST macro
 
 }  // namespace gpu