Merge change 23323 into eclair

* changes:
      For intent ACTION_PACKAGE_CHANGED, there could be a lot of broadcasts related to enabling/disabling     components by apps which could result in thrashing on the PackageManager. For apps that     do not want to be restarted when such a broadcast is sent, we can just aggregate these broadcasts and     handle them at one go.     Changes include:     New structure to hold pending broadcasts by class name. If a component is enabled or disabled frequently     aggregate component enabled/disabled settings in this structure in a 10 second window and then     send out the accumulated list of broadcasts to the ActivityManager.     A new Handler implementation handles this message     Add new attribute name EXTRA_CHANGED_COMPONENT_NAME in broadcast intent Intent.ACTION_PACKAGE_CHANGED for     additional information for apps like Launcher.     Rename a couple of parameters, the names were too jarring.