am aa318b28: am 879592d8: am bc64716c: am a2739fa7: am a4c5bba0: add document about GoogleApiClient and one about GoogleAuthUtil also remove the Authorization document from the Google Services section. bug:10679818

* commit 'aa318b2851042c6f98723446f33469a6545c7294':
  add document about GoogleApiClient and one about GoogleAuthUtil also remove the Authorization document from the Google Services section. bug:10679818