Remove flip_y, premultiply_alpha, unmultiply_alpha support in command buffer.

gpu/command_buffer/service/gles2_cmd_validation_implementation_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 241 matching lines @@
     GL_SAMPLE_COVERAGE_VALUE,
     GL_SAMPLES,
     GL_SCISSOR_BOX,
     GL_SHADER_BINARY_FORMATS,
     GL_SHADER_COMPILER,
     GL_SUBPIXEL_BITS,
     GL_STENCIL_BITS,
     GL_TEXTURE_BINDING_2D,
     GL_TEXTURE_BINDING_CUBE_MAP,
     GL_UNPACK_ALIGNMENT,
-    GL_UNPACK_FLIP_Y_CHROMIUM,
-    GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM,
-    GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM,
     GL_BIND_GENERATES_RESOURCE_CHROMIUM,
     GL_VERTEX_ARRAY_BINDING_OES,
     GL_VIEWPORT,
     GL_BLEND_COLOR,
     GL_BLEND_EQUATION_RGB,
     GL_BLEND_EQUATION_ALPHA,
     GL_BLEND_SRC_RGB,
     GL_BLEND_DST_RGB,
     GL_BLEND_SRC_ALPHA,
     GL_BLEND_DST_ALPHA,
@@ skipping 198 matching lines @@
 };
 
 static const GLenum valid_matrix_mode_table[] = {
     GL_PATH_PROJECTION_CHROMIUM,
     GL_PATH_MODELVIEW_CHROMIUM,
 };
 
 static const GLenum valid_pixel_store_table[] = {
     GL_PACK_ALIGNMENT,
     GL_UNPACK_ALIGNMENT,
-    GL_UNPACK_FLIP_Y_CHROMIUM,
-    GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM,
-    GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM,
 };
 
 static const GLenum valid_pixel_store_table_es3[] = {
     GL_PACK_ROW_LENGTH,
     GL_PACK_SKIP_PIXELS,
     GL_PACK_SKIP_ROWS,
     GL_UNPACK_ROW_LENGTH,
     GL_UNPACK_IMAGE_HEIGHT,
     GL_UNPACK_SKIP_PIXELS,
     GL_UNPACK_SKIP_ROWS,
@@ skipping 817 matching lines @@
       arraysize(valid_texture_internal_format_storage_table_es3));
   texture_parameter.AddValues(valid_texture_parameter_table_es3,
                               arraysize(valid_texture_parameter_table_es3));
   vertex_attrib_type.AddValues(valid_vertex_attrib_type_table_es3,
                                arraysize(valid_vertex_attrib_type_table_es3));
   vertex_attribute.AddValues(valid_vertex_attribute_table_es3,
                              arraysize(valid_vertex_attribute_table_es3));
 }
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_VALIDATION_IMPLEMENTATION_AUTOGEN_H_