Add the system uptime to crash dumps to better understand crashes happening after reboots.

     */

    void appendDropBoxProcessHeaders(ProcessRecord process, String processName,

            final VolatileDropboxEntryStates volatileStates, final StringBuilder sb) {

        sb.append("SystemUptimeMs: ").append(SystemClock.uptimeMillis()).append("\n");

        // Watchdog thread ends up invoking this function (with

        // a null ProcessRecord) to add the stack file to dropbox.

        // Do not acquire a lock on this (am) in such cases, as it