Fix ugly flash between boot animation and setup wizard (1/2)

When FallbackHome is displayed before the setup wizard, we need to
match the last frame of the boot animation in FallbackHome.

Bug: 29054814
Change-Id: I4f0096d398341c3749820177cebc26dea85cea05

res/drawable/fallback_home_unprovisioned_background.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016 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
+  -->
+
+<color xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="#000000" />