Add Gpu Tracing to Ganesh

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 461 matching lines @@
     } else {
         if (glVer >= GR_GL_VER(3,0) || fExtensions.has("GL_OES_vertex_array_object")) {
             if (NULL == fFunctions.fBindVertexArray ||
                 NULL == fFunctions.fDeleteVertexArrays ||
                 NULL == fFunctions.fGenVertexArrays) {
                 RETURN_FALSE_INTERFACE
             }
         }
     }
 
-#if 0
     if (fExtensions.has("GL_EXT_debug_marker")) {
         if (NULL == fFunctions.fInsertEventMarker ||
             NULL == fFunctions.fPushGroupMarker ||
             NULL == fFunctions.fPopGroupMarker) {
             RETURN_FALSE_INTERFACE
         }
     }
-#endif
     return true;
 }