Updating paging animation to spec.

- To handle the specific animation spec, we just animate the views
  manually instead of animating the stack scroll (like how we do when
  swiping to dismiss)
- Fixing a regression in settings the initial focused index when
  alt-tabbing
- Minor tweak to make the front most task smaller when in the initial
  non-paging mode

Change-Id: Ic5fd54500fd8ce8284c7aaeddb102b2291bcecac

Signed-off-by: Winson <winsonc@google.com>
diff --git a/packages/SystemUI/src/com/android/systemui/recents/misc/Utilities.java b/packages/SystemUI/src/com/android/systemui/recents/misc/Utilities.java
index 4deea54..52043f4 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/misc/Utilities.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/misc/Utilities.java
@@ -62,6 +62,8 @@
                 }
             };
 
+    public static final RectFEvaluator RECTF_EVALUATOR = new RectFEvaluator();
+
     /**
      * @return the first parent walking up the view hierarchy that has the given class type.
      *