[1/2] Base: DownloadManager: add support pause/resume/stop notifications

Add pause, resume and stop functions to make user can pause, resume and stop downloads by manual in downloads application.

Conflicts:
	core/java/android/provider/Downloads.java

Change-Id: I82ffff5a539448faab8933e2b47591199bf24cb9
Add support for single color notification LED (1/2)

Change-Id: I367af77036da9e87c6dd0df552ce4c56d945a44d