Work around MacOSX driver bug related with glGetFragDataLocation.

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 <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 1268 matching lines @@
     validators_.texture_unsized_internal_format.AddValue(GL_RED_EXT);
     validators_.texture_unsized_internal_format.AddValue(GL_RG_EXT);
   }
   UMA_HISTOGRAM_BOOLEAN("GPU.TextureRG", feature_flags_.ext_texture_rg);
 
   bool has_opengl_dual_source_blending =
       gl_version_info_->IsAtLeastGL(3, 3) ||
       (gl_version_info_->IsAtLeastGL(3, 2) &&
        extensions.Contains("GL_ARB_blend_func_extended"));
   if (!disable_shader_translator_ &&
+      !workarounds_.get_frag_data_info_bug &&
       ((gl_version_info_->IsAtLeastGL(3, 2) &&
         has_opengl_dual_source_blending) ||
        (gl_version_info_->IsAtLeastGLES(3, 0) &&
         extensions.Contains("GL_EXT_blend_func_extended")))) {
     // Note: to simplify the code, we do not expose EXT_blend_func_extended
     // unless the service context supports ES 3.0. This means the theoretical ES
     // 2.0 implementation with EXT_blend_func_extended is not sufficient.
     feature_flags_.ext_blend_func_extended = true;
     AddExtensionString("GL_EXT_blend_func_extended");
 
@@ skipping 164 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu