Configure existing ThemePicker Robolectric tests to run with atest.

Bug: 260777356
Bug: 260925899
Test: this is the test
Change-Id: I25c4efdb73dc5eb88611efac669de13fa2be0c3d
(cherry picked from commit 9a9c7c18096f41f07eef5f8e7350dd3edbc8b892)
Merged-In: I25c4efdb73dc5eb88611efac669de13fa2be0c3d
diff --git a/tests/robotests/Android.bp b/tests/robotests/Android.bp
new file mode 100644
index 0000000..e0a37c2
--- /dev/null
+++ b/tests/robotests/Android.bp
@@ -0,0 +1,17 @@
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+android_robolectric_test {
+    name: "ThemePickerRoboTests",
+    srcs: [
+        "src/**/*.java",
+        "src/**/*.kt",
+    ],
+    java_resource_dirs: ["config"],
+    libs: [
+        "androidx.test.core",
+        "androidx.test.runner",
+    ],
+    instrumentation_for: "ThemePicker",
+}