Immersive: Fix black bar in some games

Some games (FIFA14, Virtual Tennis, Rebuild etc.) show a black bar where the navigation bar used to be even in full immersive mode.
This fixes that.

Change-Id: Id7f8959da0496d95beaa21a567ef0f756b00a82d
Update clear all drawables

Signed-off-by: Andre Saddler <dresadd09691@gmail.com>
Change-Id: I8ee251b5e2144b2fd62f26cb29a0721d6b3bb72b
Signed-off-by: iceandfire <arhamjamal@gmail.com>

Conflicts:
	packages/SystemUI/res/drawable-hdpi/ic_sysbar_recent_land.png
	packages/SystemUI/res/drawable-mdpi/ic_sysbar_recent_land.png
Detach engines before destroying WallpaperService

WallpaperService contained a race condition where the service might be
destroyed before all its engines had been detached. For subclass
ImageWallpaper this would leak the engine's BroadcastListener, which in
turn would trigger a system crash (as ImageWallpaper runs as part of
the system).

Change-Id: Ia900173a1d3070cbf6bcf769f68376c8c8cbc62a

Conflicts:
	core/java/android/service/wallpaper/WallpaperService.java