Does the following
1. Uses dictionaries from the files/ directory while populating the
entries into the pendingUpdates table. So that a download happens only
if the metadata.json says so.
2. Delete an unusable dictionaries from the files/ directory.
Bug: 20142708
Change-Id: Ibd738793585c39735868e324b8ad682dff0eba34
1. Add retry count column within metadata in dictionary pack.
2. Attempt a retry for download and installation by running StartDownloadAction.
3. If the number retrial are at the threshold, we don't attempt it again.
Bug: 15150487
Change-Id: I70720353e5803fccf4728c2aa798883ba75c61e5
This adds a number to the extension.
Note that for DownloadManager to keep this, the server
needs to send it a mime type it does not recognize. Right
now, it does not recognize application/json so it's okay,
but we'd do well to remove the content/type header from
the server to prevent problems.
Bug: 8467516
Change-Id: Ic484f66ac3f67c36f59f2c0bcb8c7fdeb6e8590d
