Verify updated font is used in app process.

This CL adds a VTS test that:
1. Updates NotoColorEmoji font
2. Launches a test app that renders an emoji
3. Verifies that the updated NotoColorEmoji font file is used by the app
   process.

Bug: 180370569
Test: atest UpdatableSystemFontTest
Change-Id: I418d7cc23a290ebe4ae6e5b8af782b336497fbdd
diff --git a/tests/UpdatableSystemFontTest/EmojiRenderingTestApp/Android.bp b/tests/UpdatableSystemFontTest/EmojiRenderingTestApp/Android.bp
new file mode 100644
index 0000000..ed34fa9
--- /dev/null
+++ b/tests/UpdatableSystemFontTest/EmojiRenderingTestApp/Android.bp
@@ -0,0 +1,32 @@
+// Copyright (C) 2021 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.
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_base_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_test_helper_app {
+    name: "EmojiRenderingTestApp",
+    manifest: "AndroidManifest.xml",
+    srcs: ["src/**/*.java"],
+    test_suites: [
+        "general-tests",
+        "vts",
+    ],
+}