Support for custom HTTP headers on download requests

Provider changes:
* new many-to-one DB table holding headers for each download.  since
  there was no real migration logic in DownloadProvider, I implemented
  some.
* DownloadProvider.insert() reads request headers out of the
  ContentValues and puts them into the new table
* DownloadProvider.query() supports a new URI form,
  download/#/headers, to fetch the headers associated with a download
* DownloadProvider.delete() removes request headers from this table

Service changes:
* made DownloadInfo store request headers upon initialization.  While
  I was at it, I refactored the initialization logic into DownloadInfo
  to get rid of the massive 24-parameter constructor.  The right next
  step would be to move the update logic into DownloadInfo and merge
  it with the initialization logic; however, I realized that headers
  don't need to be updatable, and in the future, we won't need the
  update logic at all, so i didn't bother touching the update code.
* made DownloadThread read headers from the DownloadInfo and include
  them in the request; merged the custom Cookie and Referer logic into
  this logic

Also added a couple new test cases for this stuff.

Change-Id: I421ce1f0a694e815f2e099795182393650fcb3ff

0 files changed, 0 insertions, 0 deletions