Perform glReadPixels with PBOs in the gpu, if PBOs are available.

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.
 // A valid gpu_driver_bug_list.json file are in the format of
 // {
 //   "version": "x.y",
 //   "entries": [
 //     { // entry 1
@@ skipping 357 matching lines @@
         "op": "beginwith",
         "value": "ARM"
       },
       "gl_renderer": {
         "op": "contains",
         "value": "Mali-400"
       },
       "features": [
         "use_non_zero_size_for_client_side_stream_buffers"
       ]
+    },
+    {
+      "id": 25,
+      "cr_bugs": [152225],
+      "description":
+          "Intel OSX drivers prior to mountain lion crashes when using PBOs",
+      "os": {
+        "type": "macosx",
+        "version": {
+          "op": "<",
+          "number": "10.8"
+        }
+      },
+      "vendor_id": "0x8086",
+      "features": [
+        "disable_async_readpixels"
+      ]
     }
   ]
 }
 
 );  // LONG_STRING_CONST macro
 
 }  // namespace gpu
-