Done.  The 20 "exports.*" functions can be classified into 3 groups:

a. Used only within "src/process_utils.js" --> can be un-exported

    getProcessInfo_   // Done: un-exported                
    kill              // Done: un-exported
    scheduleGetTree   // kept as-is

b. Used by "test/" --> must be exported

    killAll
    killTree

c. Used by "src/" --> must be exported

    11 "schedule*" functions
    forEachRecursive
    injectWdAppLogging
    setSystemCommands
    signalKill   // used by browser_local_chrome.js