Delay rendering into Surface until draw completed.

Hold off on updating surface with animation until the Surface draw has
completed. Previously we were calling Surface.setAlpha/setLayer/
setMatrix prior to the app drawing into the surface. This fixes a bug
that caused a flash of the target animation image before the animation
had begun.

Change-Id: Id9142e09b0b22d631dc002eba4dc787455dea03a

Author: Craig Mautner

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

@@ -978,7 +978,7 @@ public void prepareSurfaceLocked(final boolean recoveringMemory) {
 
         setSurfaceBoundaries(recoveringMemory);
 
-        if (w.mAttachedHidden || !w.isReadyForDisplay()) {
+        if (w.mAttachedHidden || !w.isReadyForDisplay() || !w.isDrawnLw()) {
             if (!mLastHidden) {
                 //dump();
                 mLastHidden = true;