Merge commit '50dc3bca5afbce911636b3ba15ee953bc203a9d6' into gingerbread-plus-aosp * commit '50dc3bca5afbce911636b3ba15ee953bc203a9d6': Refactor ActivityManagerService activity stack.
Merge commit '50dc3bca5afbce911636b3ba15ee953bc203a9d6' into gingerbread-plus-aosp * commit '50dc3bca5afbce911636b3ba15ee953bc203a9d6': Refactor ActivityManagerService activity stack.