title: How to sync android repo after making changes?
body: <p>I have downloaded Android source code with repo, then I made some changes in frameworks/base/packages. Now when I trying to do repo sync, it gives me this error:</p>
  
  <blockquote>
    <p>Syncing work tree:  60% (151/251)  error: You have local changes to
    'packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java';
    cannot switch branches.</p>
  </blockquote>
  
  <p>How to fix it and upgrade all the projects that have no changes?</p>