code: func (c *Context) FrameBufferRenderBuffer(target, attachment, renderbufferTarget int, renderbuffer *js.Object) {
  	c.Call("framebufferRenderBuffer", target, attachment, renderbufferTarget, renderbuffer)
  }
docs: // Attaches a WebGLRenderbuffer object as a logical buffer to the
  // currently bound WebGLFramebuffer object.