Svetoslav 71b6ca6d43 Add JavaDoc for permission protection level
1. Add the permission protection level in the java doc

2. Make some system permissions that are not mean to be
   used by third-parties system API.

bug:21402257

Change-Id: Ic0ae8d6ca44dbbbf12848a9164acc0e908c90402
2015-06-25 18:19:19 -07:00
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