Merge "Explicitly mention again that startCommand() runs on the main thread." into gingerbread

     * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/ForegroundService.java

     *   start_compatibility}

     *

     * <p class="caution">Note that the system calls this on your

     * service's main thread.  A service's main thread is the same

     * thread where UI operations place for Activities running in the

     * same process.  You should always avoid stalling the main

     * thread's event loop.  When doing long-running operations,

     * network calls, or heavy disk I/O, you should kick off a new

     * thread, or use {@link android.os.AsyncTask}.</p>

     *

     * @param intent The Intent supplied to {@link android.content.Context#startService}, 

     * as given.  This may be null if the service is being restarted after

     * its process has gone away, and it had previously returned anything