Add command buffer support for GL_EXT_texture_sRGB_decode

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 601 matching lines @@
     // and the desktop extension GL_ARB_framebuffer_sRGB (part of the core in
     // 3.0).
     if (feature_flags_.desktop_srgb_support ||
         extensions.Contains("GL_EXT_sRGB_write_control")) {
       feature_flags_.ext_srgb_write_control = true;
       AddExtensionString("GL_EXT_sRGB_write_control");
       validators_.capability.AddValue(GL_FRAMEBUFFER_SRGB_EXT);
     }
   }
 
+  // The extension GL_EXT_texture_sRGB_decode is the same on desktop and GLES.
+  if (extensions.Contains("GL_EXT_texture_sRGB_decode") && !IsWebGLContext()) {
+    AddExtensionString("GL_EXT_texture_sRGB_decode");
+    validators_.texture_parameter.AddValue(GL_TEXTURE_SRGB_DECODE_EXT);
+  }
+
   // On desktop, GL_EXT_texture_sRGB is required regardless of GL version,
   // since the sRGB formats in OpenGL 3.0 Core do not support S3TC.
   // TODO(kainino): Support GL_EXT_texture_compression_s3tc_srgb once ratified.
   if ((gl_version_info_->is_es && extensions.Contains("GL_NV_sRGB_formats")) ||
       (!gl_version_info_->is_es &&
        extensions.Contains("GL_EXT_texture_sRGB") &&
        extensions.Contains("GL_EXT_texture_compression_s3tc"))) {
     AddExtensionString("GL_EXT_texture_compression_s3tc_srgb");
 
     validators_.compressed_texture_format.AddValue(
@@ skipping 925 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu