Don't resize WindowStates without a Surface.

Check to make sure that a WindowState has a Surface before adding it to
mResizingWindows.

Fixes bug 6300793.

Change-Id: Ieb39422523360dcdd5f5bf8109f061ae1ced62b2

Author: Craig Mautner

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

@@ -8070,7 +8070,7 @@ private int animateAwayWallpaperLocked() {
 
     private void updateResizingWindows(final WindowState w) {
         final WindowStateAnimator winAnimator = w.mWinAnimator;
-        if (!w.mAppFreezing && w.mLayoutSeq == mLayoutSeq) {
+        if (w.mHasSurface && !w.mAppFreezing && w.mLayoutSeq == mLayoutSeq) {
             w.mContentInsetsChanged |=
                 !w.mLastContentInsets.equals(w.mContentInsets);
             w.mVisibleInsetsChanged |=