The gomobile tool is part of the broader project, but that particular CL is about `gomobile build`, a sub-command designed to build all-Go apps. From inside Go,

The gomobile tool is part of the broader project, but that particular CL is about `gomobile build`, a sub-command designed to build all-Go apps. From inside Go, we have only built out access to portable APIs like OpenGL. This app uses a different mode of the same tool, `gomobile bind`. This lets you use a Go package from inside an Android app, or from ObjC in an iOS app. It is related but parallel work.