Integration test for updatable system font.

This test:
(1) signs a font file with the test key.
(2) side-loads the test cert to the device under test.
(3) verifies that the signed font file can be installed.

The device must be rootable for doing step (2).

Bug: 176939176
Test: atest UpdatableSystemFontTest
Change-Id: I7a9b614aa3c77589c3495b663cb76056ba657006
diff --git a/tests/ApkVerityTest/Android.bp b/tests/ApkVerityTest/Android.bp
index 02c75ed..39dc9c2 100644
--- a/tests/ApkVerityTest/Android.bp
+++ b/tests/ApkVerityTest/Android.bp
@@ -16,6 +16,7 @@
     name: "ApkVerityTest",
     srcs: ["src/**/*.java"],
     libs: ["tradefed", "compatibility-tradefed", "compatibility-host-util"],
+    static_libs: ["frameworks-base-hostutils"],
     test_suites: ["general-tests", "vts"],
     target_required: [
         "block_device_writer_module",