proto filtering: add MessageTokenizer

Bug: 181306741
Change-Id: Ibff18c635c6b938d214bd3a52faf6d9a9dd4b84b
diff --git a/Android.bp b/Android.bp
index 18167f0..6f1247b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -7437,6 +7437,7 @@
   srcs: [
     "src/protozero/filtering/filter_bytecode_generator_unittest.cc",
     "src/protozero/filtering/filter_bytecode_parser_unittest.cc",
+    "src/protozero/filtering/message_tokenizer_unittest.cc",
   ],
 }