Add Launcher aconfig.

Use `enable_expanding_pause_work_button` as an example.

See go/trunk-stable-launcher for implementation details

Bug: 294913042

Test: adb shell device_config put launcher com.google.android.platform.launcher.aconfig.flags.enable_expanding_pause_work_button true

Flag: enable_expanding_pause_work_button
Change-Id: I732722c8b219c023adf5bf31f132ce9da72fc4d5
diff --git a/tests/Android.bp b/tests/Android.bp
index 5a52440..96ffa76 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -73,6 +73,7 @@
     asset_dirs: ["assets"],
     resource_dirs: ["res"],
     static_libs: [
+        "flag-junit-base",
         "launcher-aosp-tapl",
         "androidx.test.core",
         "androidx.test.runner",
@@ -87,6 +88,7 @@
         "truth-prebuilt",
         "platform-test-rules",
         "testables",
+        "launcher_flags_lib_test",
     ],
     manifest: "AndroidManifest-common.xml",
     platform_apis: true,
@@ -103,7 +105,10 @@
         ":launcher-tests-src",
         ":launcher-non-quickstep-tests-src",
     ],
-    static_libs: ["Launcher3TestLib"],
+    static_libs: [
+        "Launcher3TestLib",
+        "launcher_flags_lib_test",
+    ],
     libs: [
         "android.test.base",
         "android.test.runner",