am 55744530: Merge "resolved conflicts for merge of b4ae2f1b to gingerbread-plus-aosp" into gingerbread-plus-aosp

Merge commit '55744530222288c79a5e1aa61b65f7f6b2262fab'

* commit '55744530222288c79a5e1aa61b65f7f6b2262fab':
  frameworks/base: Handle null from topRunningNonDelayedActivityLocked