luci_deploy: Enable loading "index.yaml" directly.

deploytool/api/deploy/component.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 deploy;
 
 import "google/protobuf/duration.proto";
 
@@ skipping 202 matching lines @@
   /**
    * Source-relative path of additional AppEngineResources text protobuf files
    * to load and associate with this module.
    *
    * Resources imported here are treated the same as if they were declared in
    * the "resources" field.
    *
    * Resource paths may include deployment parameters.
    */
   repeated string resource_path = 23;
+
+  /**
+   * The source-relative path to an "index.yaml" file that can be imported.
+   *
+   * This is specifically useful since GAE development instances are capable
+   * of generating their own index data after observing module behavior. A user
+   * may want to use this behavior directly ratehr rather than translate it
+   * ininto an AppEngineResources protobuf.
+   *
+   * If this is not empty, an "index.yaml" file will be loaded from this path
+   * and appended to any other defined indexes.
+   */
+  string index_yaml_path = 24;
 }
 
 /**
  * Defines a set of AppEngine-wide resources.
  *
  * These are aggregated between all registered AppEngine modules within a
  * project.
  */
 message AppEngineResources {
   /* Defines an index. */
@@ skipping 320 matching lines @@
 
   /** Labels to apply to this pod. */
   map<string, string> labels = 11;
 
   /**
    * Deployment configuration value for amount of non-crashing time before this
    * pod is available.
    */
   google.protobuf.Duration min_ready = 12;
 }