Add command buffer support for GL_EXT_texture_sRGB_decode

gpu/command_buffer/service/gles2_cmd_validation_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_validation_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_validation_autogen.h b/gpu/command_buffer/service/gles2_cmd_validation_autogen.h
index 1223a22f1b5862eb6c45294fa4bc2a4ef9f481e0..2be3bab9c4afecfaa50c687ff8d8adc336dbf44d 100644
--- a/gpu/command_buffer/service/gles2_cmd_validation_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_validation_autogen.h
@@ -344,6 +344,12 @@ TextureMinFilterModeValidator texture_min_filter_mode;
 ValueValidator<GLenum> texture_parameter;
 ValueValidator<GLenum> texture_sized_color_renderable_internal_format;
 ValueValidator<GLenum> texture_sized_texture_filterable_internal_format;
+class TextureSrgbDecodeExtValidator {
+ public:
+  bool IsValid(const GLenum value) const;
+};
+TextureSrgbDecodeExtValidator texture_srgb_decode_ext;
+
 ValueValidator<GLenum> texture_stencil_renderable_internal_format;
 class TextureSwizzleValidator {
  public: