Imports of package capability

PathSynopsis
golang.org/x/net/contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
google.golang.org/appengine/internalPackage internal provides support for package appengine.
google.golang.org/appengine/internal/capability
google.golang.org/appengine/logPackage log provides the means of writing and querying an application's logs from within an App Engine application.