[DO NOT MERGE] Use custom slide-up animation on LMP MR1 instead of system default

issue 21402755

Change-Id: I87ddef08e7b3134c791f769fc279e62d520cd18c
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 2fc3b75..48f3901 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2943,10 +2943,15 @@
             Bundle optsBundle = null;
             if (useLaunchAnimation && !Utilities.isLmpOrAbove()) {
                 // On pre-L devices, we use the scale up transition.
-                // Otherwise we use system default.
                 ActivityOptions opts =
                         ActivityOptions.makeScaleUpAnimation(v, 0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
                 optsBundle = opts.toBundle();
+            } else if (useLaunchAnimation && Utilities.isLmpMr1()) {
+                // On L-MR1 devices, we use custom slide up animation without a delay
+                // On L devices, we use the system default slide up.
+                ActivityOptions opts = ActivityOptions.makeCustomAnimation(this,
+                        R.anim.task_open_enter, R.anim.no_anim);
+                optsBundle = opts.toBundle();
             }
 
             if (user == null || user.equals(UserHandleCompat.myUserHandle())) {