Add differentiating transitions for returning/reentering.

Bug 16550363

Change-Id: I85f9a8bcbc92ce048d06b36579bb05893534f7f8
diff --git a/core/java/android/app/EnterTransitionCoordinator.java b/core/java/android/app/EnterTransitionCoordinator.java
index 1326064..b5d362d 100644
--- a/core/java/android/app/EnterTransitionCoordinator.java
+++ b/core/java/android/app/EnterTransitionCoordinator.java
@@ -256,7 +256,7 @@
     @Override
     protected Transition getViewsTransition() {
         if (mIsReturning) {
-            return getWindow().getExitTransition();
+            return getWindow().getReenterTransition();
         } else {
             return getWindow().getEnterTransition();
         }
@@ -264,7 +264,7 @@
 
     protected Transition getSharedElementTransition() {
         if (mIsReturning) {
-            return getWindow().getSharedElementExitTransition();
+            return getWindow().getSharedElementReenterTransition();
         } else {
             return getWindow().getSharedElementEnterTransition();
         }