Widevine MediaCas client code that works with Android R

oemcrypto/Android.bp

@@ -0,0 +1,10 @@
+// Remove two lines below to build reference
+// implementation of CAS oemcrypto.
+soong_namespace {
+}
+
+cc_library_headers {
+  name: "oemcastroheaders",
+  export_include_dirs: ["include"],
+  proprietary: true,
+}