Start the correct settings from the status bar.

Added a new method to Context: startActivityAsUser() requiring the
INTERACT_ACROSS_USERS_FULL permission.

Show the correct Recents list, based on current user.
Added a getRecentTasksForUser() in ActivityManager. Hidden and requires
the INTERACT_ACROSS_USERS_FULL permission.

Change-Id: If5b56465efdd3ead36601a3b51ed4af157bbf35c
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index 10849f6..51dc3b1 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -40,6 +40,7 @@
     <uses-permission android:name="android.permission.STOP_APP_SWITCHES" />
     <uses-permission android:name="android.permission.SET_SCREEN_COMPATIBILITY" />
     <uses-permission android:name="android.permission.START_ANY_ACTIVITY" />
+    <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />
 
     <!-- WindowManager -->
     <uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />