Fix flashy transition in QuickContacts

Calls to relayout were forcing outgoing app reported visibility to
false. Because there was a DummyAnimation in the outgoing app the
stepAnimation was forcing the app Transformation alpha value to 0
based on the most recent reportedVisibile value. This was causing the
outgoing app to disappear for an instant.  Moving the visibility test
to the time at which the DummyAnimation is set fixes this problem.

Fixes bug 5908102.

Change-Id: Ib574728a007a0af759990816db42e23ba315b468

Author: Craig Mautner

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

@@ -85,6 +85,9 @@ public void setDummyAnimation() {
             animation = sDummyAnimation;
             animInitialized = false;
         }
+        hasTransformation = true;
+        transformation.clear();
+        transformation.setAlpha(mAppToken.reportedVisible ? 1 : 0);
     }
 
     public void clearAnimation() {
@@ -186,8 +189,6 @@ boolean stepAnimationLocked(long currentTime, int dw, int dh) {
                 // it as not animating for purposes of scheduling transactions;
                 // when it is really time to animate, this will be set to
                 // a real animation and the next call will execute normally.
-                hasTransformation = true;
-                transformation.setAlpha(mAppToken.reportedVisible ? 1 : 0);
                 return false;
             }