To make such OBJ you can use Blender.
It generate ready to use in WebGL indices, vertices, vertex normals and texture coordinates.
Examples:
http://www.kurilo.su/workingprocess/webgl/
http://www.kurilo.su/workingprocess/webgl/mrhumpty.html
http://www.kurilo.su/workingprocess/webgl/building.html
http://www.kurilo.su/workingprocess/webgl/building1.html
http://www.kurilo.su/workingprocess/webgl/spider.html