Load the GL_KHR_debug entry points and log messages they produce.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 3478 matching lines @@
   }
 
   if (workarounds().gl_clear_broken) {
     DCHECK(!clear_framebuffer_blit_.get());
     LOCAL_COPY_REAL_GL_ERRORS_TO_WRAPPER("glClearWorkaroundInit");
     clear_framebuffer_blit_.reset(new ClearFramebufferResourceManager(this));
     if (LOCAL_PEEK_GL_ERROR("glClearWorkaroundInit") != GL_NO_ERROR)
       return false;
   }
 
+  if (group_->gpu_preferences().enable_gpu_driver_debug_logging &&
+      feature_info_->feature_flags().khr_debug) {
+    InitializeGLDebugLogging();
+  }
+
   return true;
 }
 
 Capabilities GLES2DecoderImpl::GetCapabilities() {
   DCHECK(initialized());
   Capabilities caps;
   const gl::GLVersionInfo& version_info = gl_version_info();
   caps.VisitPrecisions([&version_info](
       GLenum shader, GLenum type,
       Capabilities::ShaderPrecision* shader_precision) {
@@ skipping 15263 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu