[recipes.cfg] add autoroll options.

TBR=dnj@chromium.org

Bug:

Change-Id: I6f607578197408734da238189465ae1ff6a2000d
Reviewed-on: https://chromium-review.googlesource.com/478833
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>

infra/config/recipes.cfg

@@ -1,5 +1,6 @@
 {
   "api_version": 2,
+  "canonical_repo_url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git",
   "deps": {
     "recipe_engine": {
       "branch": "master",
@@ -8,5 +9,16 @@
     }
   },
   "project_id": "depot_tools",
-  "recipes_path": "recipes"
-}
+  "recipes_path": "recipes",
+  "autoroll_recipe_options": {
+    "trivial": {
+      "tbr_emails": [
+        "iannucci@chromium.org"
+      ],
+      "automatic_commit": true
+    },
+    "nontrivial": {
+      "automatic_commit_dry_run": true
+    }
+  }
+}