base

Fix issue #7343200: Fails to show wallpaper in the background for...

...lockscreen sometimes and remains black / blank

The problem was that we were using the animation-side wallpaper state
in cases where it was not updated yet.

The mWallpaperTarget variable is propagated over to the animation
side when the main window manager state updates.  On the animation
side, this is used by hideWallpapersLocked() to determine if the
current wallpaper should be hidden.

The problem is that various paths to hideWallpapersLocked() can
come from the layout side of the window manager instead of the
animation side.  This causes the problem here because in this case
the wallpaper state may not have yet been propagated to the
animation side, so it could incorrectly decide to hide the wallpaper
because it thinks there is not a target when in fact a target is
set in the layout side.  This won't get fixed until some time way
later that the layout side decides that a new window is being shown
that may need to have the wallpaper shown.

The fix here is pretty gross, but as safe as possible -- the
hideWallpapersLocked() function now uses either the animation or
layout wallpaper state depending on where the call to it is coming
from.

Change-Id: I9250bfeae6e11c1761760bcc696fdb33fb5c8a5f