Add new gpu driver bug workaround DISABLE_TRANSPARENT_VISUALS

gpu/config/gpu_driver_bug_workaround_type.h

Index: gpu/config/gpu_driver_bug_workaround_type.h
diff --git a/gpu/config/gpu_driver_bug_workaround_type.h b/gpu/config/gpu_driver_bug_workaround_type.h
index 2f1f865f7809ee01ec0b27e39e1b0fe76b6d1300..9144d434a66e239936b51384a7a539f11db23261 100644
--- a/gpu/config/gpu_driver_bug_workaround_type.h
+++ b/gpu/config/gpu_driver_bug_workaround_type.h
@@ -65,6 +65,8 @@
          disable_texture_storage)                            \
   GPU_OP(DISABLE_TIMESTAMP_QUERIES,                          \
          disable_timestamp_queries)                          \
+  GPU_OP(DISABLE_TRANSPARENT_VISUALS,                        \
+         disable_transparent_visuals)                        \

[Ken Russell (switch to Gerrit), 2016/07/07 22:23:40]

As Corentin pointed out elsewhere, changing the sense of this driver bug
workaround to "use_transparent_visuals" would make it more clear on which
platforms it's enabled. The "exceptions" field wouldn't be needed in
gpu_driver_bug_list_json.cc.

[Julien Isorce Samsung, 2016/07/08 09:52:53]

My understanding was that Corentin wanted to have it changed only in the
function, so I did it in Patch Set 6:
https://codereview.chromium.org/2124633002/diff2/80001:100001/ui/base/x/x11_u...

For the workaround name I would like to keep the current name since it is
coherent with other workaround names. For example, using transparent visuals is
the expected working usage, but if there is a bug then it disables it.

[Ken Russell (switch to Gerrit), 2016/07/12 22:46:26]

OK. I'm not 100% convinced that the future direction is to always use
transparent visuals, but either way is fine. Note that there is precedence in
this file for the "use_" naming convention.

   GPU_OP(DISABLE_WEBGL_MULTISAMPLING_COLOR_MASK_USAGE,       \
          disable_webgl_multisampling_color_mask_usage)       \
   GPU_OP(DISABLE_WEBGL_RGB_MULTISAMPLING_USAGE,              \