Annotation protobuf code can now dump final.

recipe_engine/arguments.proto

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 syntax = "proto3";
 
 package recipe_engine;
 
 // Arguments is a protobuf that can be supplied to the recipe engine through its
 // "--operational-args-path" command-line parameter in JSONPB format.
@@ skipping 63 matching lines @@
     // The LogDog streamserver URI.
     string streamserver_uri = 1;
 
     // The log stream base name. If provided, generated stream names will be
     // prefixed with "<name_base>/". This must be a valid LogDog stream name.
     string name_base = 2;
 
     // If true, tee output through STDOUT/STDERR using inline @@@annotation@@@
     // markers in addition to LogDog streaming.
     bool tee = 3;
+
+    // If not empty, this is a path where the final annotation protobuf should
+    // be dumped on completion.
+    string final_annotation_dump_path = 4;
   }
   LogDogFlags logdog = 3;
 }