Configure existing ThemePicker Robolectric tests to run with atest.

Submitting here first to resolve conflicts from upstream branches, will
cherry-pick into aosp-master afterwards.

For now, broken tests are marked @Ignore.

Also moves Robolectric tests into directory under tests/ for similar
structure to other test code in the wider codebase.

Bug: 260777356
Bug: 260925899
Test: this is the test
Change-Id: I25c4efdb73dc5eb88611efac669de13fa2be0c3d
diff --git a/tests/robotests/AndroidManifest.xml b/tests/robotests/AndroidManifest.xml
new file mode 100644
index 0000000..753aa9e
--- /dev/null
+++ b/tests/robotests/AndroidManifest.xml
@@ -0,0 +1,20 @@
+<!--
+  ~ Copyright (C) 2022 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.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.customization">
+    <application/>
+</manifest>