Fix #2313382: SECURITY: Live wallpapers get touch events through the lock screen.

This is a quick and dirty hack to not deliver touch events to the wallpaper when
they are being sent to the keyguard.  Perhaps we should have a separate window
flag for this, but...  bleah.  Maybe later.  Or maybe I'll use that secure flag.
Or something.

Change-Id: Ifd95b9f5b10db24a0854a93b925a833b24331b4c

services/java/com/android/server/WindowManagerService.java

@@ -6014,7 +6014,9 @@ public class WindowManagerService extends IWindowManager.Stub
                 
                 if (res != null && returnWhat == RETURN_PENDING_POINTER) {
                     synchronized (mWindowMap) {
-                        if (mWallpaperTarget == win || mSendingPointersToWallpaper) {
+                        if ((mWallpaperTarget == win &&
+                                win.mAttrs.type != WindowManager.LayoutParams.TYPE_KEYGUARD)
+                                || mSendingPointersToWallpaper) {
                             sendPointerToWallpaperLocked(win, res, res.getEventTime());
                         }
                     }