am 502a15ff: am c698a855: am d1c9d6e8: am 3b8381e1: am 7bb37c87: am 0480d5d8: Merge "docs: Android SDK 21.1.0 Release Notes" into jb-mr1-dev

# Via Android Git Automerger (5) and others
* commit '502a15ffe83608636a83721214bf06bba60242bf':
  docs: Android SDK 21.1.0 Release Notes