LogDog: Support per-namespace expired archival.

common/api/logdog_coordinator/services/v1/tasks.proto

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 syntax = "proto3";
 
 package logdog;
 
 import "google/protobuf/duration.proto";
 
@@ skipping 14 matching lines @@
   // into intermediate storage.
   google.protobuf.Duration settle_delay = 3;
 
   // The amount of time after the task was created that log stream completeness
   // will be used as a success criteria. If the task's age is older than this
   // value, completeness will not be enforced.
   //
   // The task's age can be calculated by subtracting its lease expiration time
   // (leaseTimestamp) from its enqueued timestamp (enqueueTimestamp).
   google.protobuf.Duration complete_period = 4;
+
+  // The name of the project that this stream is bound to.
+  string project = 5;
 }