am 1ce4394c: Merge "Throttle userActivity calls from input dispatcher." into gingerbread

Merge commit '1ce4394c779be5e67e37bbb995da13865b36c573' into gingerbread-plus-aosp

* commit '1ce4394c779be5e67e37bbb995da13865b36c573':
  Throttle userActivity calls from input dispatcher.