base

Step 1 in consolidating wallpaper animation.

- Merge testWallpaperAndBackgroundLocked into
updateWindowsAndWallpaperLocked. Eliminates mDetachedWallpaper,
mWindowAnimationBackground, and mWindowAnimationBackgroundColor.

- Merge multiple calls to perform layout into one.

- Cleaned up debug output.

Change-Id: I5dc2d8330dc092ee2b165867cddb7d16b431fa0b