Switch to faster enter/exit animations for herb tabs.

chrome/android/java/res/anim/activity_open_enter.xml

Index: chrome/android/java/res/anim/activity_open_enter.xml
diff --git a/chrome/android/java/res/anim/activity_open_enter.xml b/chrome/android/java/res/anim/activity_open_enter.xml
new file mode 100644
index 0000000000000000000000000000000000000000..9113119e175d116c20823aded7d2cbcd0bc84883
--- /dev/null
+++ b/chrome/android/java/res/anim/activity_open_enter.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2016 The Chromium Authors. All rights reserved.
+
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file.
+-->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+        android:shareInterpolator="false"
+        android:zAdjustment="top">
+    <alpha android:fromAlpha="0.0"
+            android:toAlpha="1.0"
+            android:interpolator="@anim/decelerate_quart"
+            android:fillEnabled="true"
+            android:fillBefore="false"
+            android:fillAfter="true"
+            android:duration="200"/>
+    <translate android:fromYDelta="8%"
+            android:toYDelta="0"
+            android:fillEnabled="true"
+            android:fillBefore="true"
+            android:fillAfter="true"
+            android:interpolator="@android:interpolator/decelerate_quint"
+            android:duration="300"/>
+</set>