Only allow TexStorage2DEXT if we expose the extension

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

 // Copyright 2014 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 4390 matching lines @@
                                     level, samples);
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleTexStorage2DEXT(
     uint32_t immediate_data_size,
     const void* cmd_data) {
   const gles2::cmds::TexStorage2DEXT& c =
       *static_cast<const gles2::cmds::TexStorage2DEXT*>(cmd_data);
   (void)c;
+  if (!features().ext_texture_storage) {
+    return error::kUnknownCommand;
+  }
+
   GLenum target = static_cast<GLenum>(c.target);
   GLsizei levels = static_cast<GLsizei>(c.levels);
   GLenum internalFormat = static_cast<GLenum>(c.internalFormat);
   GLsizei width = static_cast<GLsizei>(c.width);
   GLsizei height = static_cast<GLsizei>(c.height);
   if (!validators_->texture_bind_target.IsValid(target)) {
     LOCAL_SET_GL_ERROR_INVALID_ENUM("glTexStorage2DEXT", target, "target");
     return error::kNoError;
   }
   if (levels < 0) {
@@ skipping 886 matching lines @@
         state_.enable_flags.cached_sample_alpha_to_one_ext = enabled;
         return true;
       }
       return false;
     default:
       NOTREACHED();
       return false;
   }
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_