Add task layer drawable class for Recents Go.

Add a custom drawable class that provides a hook to the caller to
control a crossfade animation between two drawables. This will be
helpful going forward to sync up all the animations to the controller.

Note that this CL only adds the class and does not replace the current
implementation.

Bug: 114136250
Test: Builds
Change-Id: I3cc6be79cb2ca5d64c8cc2945ff7f2ebd49632b6
(cherry picked from commit bb956bd02887f1cfc1ab0f193bc47d77f53238b4)

1 files changed, 23 insertions, 0 deletions

diff --git a/go/quickstep/res/drawable/empty_content_box.xml b/go/quickstep/res/drawable/empty_content_box.xml
new file mode 100644
index 000000000..a4883889f
--- /dev/null
+++ b/go/quickstep/res/drawable/empty_content_box.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2019 The Android Open Source Project
+
+     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.
+-->
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@android:color/transparent"/>
+    <stroke android:color="@android:color/white" android:width="4px"/>
+    <corners android:radius="2dp"/>
+</shape>
\ No newline at end of file