[Payments] Implement openWindow for service worker based payment handler

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

Index: chrome/android/java/res/anim/slide_out_down.xml
diff --git a/chrome/android/java/res/anim/slide_out_down.xml b/chrome/android/java/res/anim/slide_out_down.xml
new file mode 100644
index 0000000000000000000000000000000000000000..f60ec352be71041662d6ab39fa3b7ca382f47ec3
--- /dev/null
+++ b/chrome/android/java/res/anim/slide_out_down.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2017 The Chromium Authors. All rights reserved
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<translate
+    xmlns:android="http://schemas.android.com/apk/res/android"
+
+    android:fromYDelta="0"
+    android:toYDelta="100%p"
+
+    android:duration="@android:integer/config_longAnimTime" />