Workaround for Intel 6xxx clear to 0/1 bug

gpu/config/gpu_driver_bug_list.json

 {
   "name": "gpu driver bug list",
-  "version": "10.13",
+  "version": "10.14",
   "entries": [
     {
       "id": 1,
       "description": "Imagination driver doesn't like uploading lots of buffer data constantly",
       "os": {
         "type": "android"
       },
       "gl_vendor": "Imagination.*",
       "features": [
         "use_client_side_arrays_for_stream_buffers"
@@ skipping 2503 matching lines @@
       "id": 233,
       "description": "Delayed copy NV12 displays incorrect colors on NVIDIA drivers.",
       "cr_bugs": [728670],
       "os": {
         "type": "win"
       },
       "vendor_id": "0x10de",
       "features": [
         "disable_delayed_copy_nv12"
       ]
+    },
+    {
+      "id": 234,
+      "description": "glClearColor does not always work on Intel 6xxx Mac drivers",
+      "cr_bugs": [710443],
+      "os": {
+        "type": "macosx",
+        "version": {
+          "op": "<=",
+          "value": "10.12.4"
+        }
+      },
+      "vendor_id": "0x8086",
+      "gl_renderer": "Intel\\(R\\) (HD|Iris\\(TM\\)) Graphics 6.*",

[Zhenyao Mo, 2017/06/13 19:01:24]

That's not good to use gl_renderer on Mac because it's not available until very
late. Let's list all affected device IDs on MacOSX. There should be only a few.

[jiajia.qin, 2017/06/14 08:18:21]

Done.

+      "features": [
+        "clear_to_boundary_values_is_broken"
+      ]
     }
   ],
   "comment": [
     "Please update the version number on top whenever you change this file"
   ]
 }