DownloaderService is structured to be as simple as possible, and as tightly
matched to the downloading lifecycle as possible, with a single queue for
all requests to avoid downloads competing for bandwidth. This does not
represent the possibilities of the whole install process. For example,
downloading can happen in parallel with checking the cache, and if an APK
is fully cached, there is no need for it to go through the DownloaderService
queue.
This also lays the groundwork towards simplifying DownloaderService even
more, by moving the Notification handling to InstallManagerService. That
will provide a single place to manage all aspects of the Notifications that
has a lifecycle that is longer than the Notifications, unlike an Activity
or DownloaderService.
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