am 50dc3bca: Refactor ActivityManagerService activity stack.

Merge commit '50dc3bca5afbce911636b3ba15ee953bc203a9d6' into gingerbread-plus-aosp

* commit '50dc3bca5afbce911636b3ba15ee953bc203a9d6':
  Refactor ActivityManagerService activity stack.
tree: e11ece813e7706829653b269fccf30bd4a8d8726
  1. awt/
  2. camera/
  3. cmds/
  4. include/
  5. libs/
  6. opengl/
  7. vpn/
  8. MODULE_LICENSE_APACHE2
  9. NOTICE