Get root container stats from cAdvisor

I changed the GetContainerStats function, which will return the root container's stats if the container name is empty. This is useful when the master wants to know machine wide information. e.g. total memory usage of a certain node.
Where is client/container_info.go? I cannot find this file. I tried to grep keyword "stats" in the project, but the only place I could find is in kubelet.go, kubelet_server.go, kubelet_test.go and kubelet_server_test.go.