[1/2] Add to support pause/resume download

We add pause and resume API here so that application can
pause and resume downloads manually by DownloadManager.
This contains two points:
1. add pause and resume download APIs.
2. add another paused reason for this download status.

PS2/3:
* Fix code.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I606b48ca20f43bcc6c119683818c2ab6ff03bfe5
Long press recents to switch to last app

Change-Id: I8c52a7b40d4229d523bccc1c9246673b82f5b48b
Conflicts:
	packages/SystemUI/res/values/pa_strings.xml