Blacklist EXT_draw_buffers on Mac NVIDIA GeForce GT 650M.

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 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.
 
 #include "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/string_util.h"
@@ skipping 572 matching lines @@
   }
 
   if (extensions.Contains("GL_ANGLE_instanced_arrays") ||
       (extensions.Contains("GL_ARB_instanced_arrays") &&
        extensions.Contains("GL_ARB_draw_instanced"))) {
     AddExtensionString("GL_ANGLE_instanced_arrays");
     feature_flags_.angle_instanced_arrays = true;
     validators_.vertex_attribute.AddValue(GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE);
   }
 
-  if (extensions.Contains("GL_ARB_draw_buffers")) {
+  if (!workarounds_.disable_ext_draw_buffers &&
+      (extensions.Contains("GL_ARB_draw_buffers") ||
+       extensions.Contains("GL_EXT_draw_buffers"))) {
     AddExtensionString("GL_EXT_draw_buffers");
     feature_flags_.ext_draw_buffers = true;
 
     GLint max_color_attachments = 0;
     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &max_color_attachments);
     for (GLenum i = GL_COLOR_ATTACHMENT1_EXT;
          i < static_cast<GLenum>(GL_COLOR_ATTACHMENT0 + max_color_attachments);
          ++i) {
       validators_.attachment.AddValue(i);
     }
@@ skipping 30 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu