Revert "Accelerate the lighten blendmode if GL_EXT_blend_minmax is enabled."

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/macros.h"
@@ skipping 126 matching lines @@
       ext_shader_texture_lod(false),
       use_async_readpixels(false),
       map_buffer_range(false),
       ext_discard_framebuffer(false),
       angle_depth_texture(false),
       is_angle(false),
       is_swiftshader(false),
       angle_texture_usage(false),
       ext_texture_storage(false),
       chromium_path_rendering(false),
-      ext_blend_minmax(false),
       blend_equation_advanced(false),
       blend_equation_advanced_coherent(false) {
 }
 
 FeatureInfo::Workarounds::Workarounds() :
 #define GPU_OP(type, name) name(false),
     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
 #undef GPU_OP
     max_texture_size(0),
     max_cube_map_texture_size(0),
@@ skipping 655 matching lines @@
     glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buffers);
     for (GLenum i = GL_DRAW_BUFFER0_ARB;
          i < static_cast<GLenum>(GL_DRAW_BUFFER0_ARB + max_draw_buffers);
          ++i) {
       validators_.g_l_state.AddValue(i);
     }
   }
 
   if (is_es3 || extensions.Contains("GL_EXT_blend_minmax") ||
       gfx::HasDesktopGLFeatures()) {
-    feature_flags_.ext_blend_minmax = true;
     AddExtensionString("GL_EXT_blend_minmax");
     validators_.equation.AddValue(GL_MIN_EXT);
     validators_.equation.AddValue(GL_MAX_EXT);
     COMPILE_ASSERT(GL_MIN_EXT == GL_MIN && GL_MAX_EXT == GL_MAX,
                    min_max_variations_must_match);
   }
 
   // TODO(dshwang): GLES3 supports gl_FragDepth, not gl_FragDepthEXT.
   if (extensions.Contains("GL_EXT_frag_depth") || gfx::HasDesktopGLFeatures()) {
     AddExtensionString("GL_EXT_frag_depth");
@@ skipping 104 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu