Add test_com.android.media[.swcodec]

Test: make test_com.android.media[.swcodec]
      vendor/google/build/build_mainline_modules.sh
Bug: 123704841

Change-Id: I322cf25460d142b6691aa1e21b51a0cf7840c18e
diff --git a/apex/testing/test_manifest.json b/apex/testing/test_manifest.json
new file mode 100644
index 0000000..9f81f9f
--- /dev/null
+++ b/apex/testing/test_manifest.json
@@ -0,0 +1,4 @@
+{
+  "name": "com.android.media",
+  "version": 2
+}