Support android.util.proto under Ravenwood.

Enables both underlying code and relevant tests to confirm that it
passes consistently on both devices and Ravenwood.

Bug: 292141694
Test: atest-dev CtsProtoTestCasesRavenwood
Change-Id: Ida9c5334db062e98ce1b3ec0d65491a5e626ecd9
diff --git a/framework-minus-apex-ravenwood-policies.txt b/framework-minus-apex-ravenwood-policies.txt
index 6fd346f..8e76fd2 100644
--- a/framework-minus-apex-ravenwood-policies.txt
+++ b/framework-minus-apex-ravenwood-policies.txt
@@ -59,6 +59,15 @@
 class android.util.Size stubclass
 class android.util.SizeF stubclass
 
+# Proto
+class android.util.proto.EncodedBuffer stubclass
+class android.util.proto.ProtoInputStream stubclass
+class android.util.proto.ProtoOutputStream stubclass
+class android.util.proto.ProtoParseException stubclass
+class android.util.proto.ProtoStream stubclass
+class android.util.proto.ProtoUtils stubclass
+class android.util.proto.WireTypeMismatchException stubclass
+
 # Misc
 class android.util.Dumpable stubclass
 class android.util.DebugUtils stubclass