init DownloadProvider from Android-4.4.3

N/A

Signed-off-by: wuyexiong [伍业雄] <wuyexiong@xiaomi.com>
New:FixTest Error, Download Test Done

N/A

Signed-off-by: wuyexiong [伍业雄] <wuyexiong@xiaomi.com>
Merge remote-tracking branch 'origin/master'

* origin/master:
  Initial commit

Conflicts:
	.gitignore