am 6de4aed1: Fixes #1933428. Call onPrepareDialog() on managed dialogs after their onCreate() is finished.

Merge commit '6de4aed1c67263269f83f579ec5b06263d173ef3'

* commit '6de4aed1c67263269f83f579ec5b06263d173ef3':
  Fixes #1933428. Call onPrepareDialog() on managed dialogs after their onCreate() is finished.