am 5977f7d5: am d23a8692: am 14e40f04: am fd117ff2: Doc change: zh-cn translation of Android L overviews. cherrypick from  I56d1ce58e10b83d10d0077cc9dfbeb04f090b861

* commit '5977f7d52008f9b8dfc429acfde222a6e0afb2a2':
  Doc change: zh-cn translation of Android L overviews. cherrypick from  I56d1ce58e10b83d10d0077cc9dfbeb04f090b861