gpu: Make pack/unpack alignment part of autogenerated state

gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h

 // 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // DO NOT EDIT!
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_VALIDATION_IMPLEMENTATION_AUTOGEN_H_  // NOLINT
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_VALIDATION_IMPLEMENTATION_AUTOGEN_H_  // NOLINT
@@ skipping 174 matching lines @@
   GL_DEPTH_CLEAR_VALUE,
   GL_STENCIL_CLEAR_VALUE,
   GL_COLOR_WRITEMASK,
   GL_CULL_FACE_MODE,
   GL_DEPTH_FUNC,
   GL_DEPTH_WRITEMASK,
   GL_DEPTH_RANGE,
   GL_FRONT_FACE,
   GL_GENERATE_MIPMAP_HINT,
   GL_LINE_WIDTH,
+  GL_PACK_ALIGNMENT,
+  GL_UNPACK_ALIGNMENT,
   GL_POLYGON_OFFSET_FACTOR,
   GL_POLYGON_OFFSET_UNITS,
   GL_SAMPLE_COVERAGE_VALUE,
   GL_SAMPLE_COVERAGE_INVERT,
   GL_SCISSOR_BOX,
   GL_STENCIL_FUNC,
   GL_STENCIL_REF,
   GL_STENCIL_VALUE_MASK,
   GL_STENCIL_BACK_FUNC,
   GL_STENCIL_BACK_REF,
@@ skipping 458 matching lines @@
           valid_vertex_attribute_table, arraysize(
               valid_vertex_attribute_table)),
       vertex_pointer(
           valid_vertex_pointer_table, arraysize(valid_vertex_pointer_table)),
       zero_only(
           valid_zero_only_table, arraysize(valid_zero_only_table)) {
 }
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_VALIDATION_IMPLEMENTATION_AUTOGEN_H_  // NOLINT