[autoroll] Add email notifications for Swiftshader -> Chromium roller

Bug: skia:8801
Change-Id: I713110e23af910fe1326d05e79a40fb7ae247f28
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/197123
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/autoroll/config/swiftshader-chromium.json b/autoroll/config/swiftshader-chromium.json
index 633320b..5b2ae96 100644
--- a/autoroll/config/swiftshader-chromium.json
+++ b/autoroll/config/swiftshader-chromium.json
@@ -39,5 +39,31 @@
     "readinessPeriodSeconds": "30",
     "readinessFailureThreshold": "10"
   },
-  "maxRollFrequency": "0m"
+  "maxRollFrequency": "0m",
+  "notifiers": [
+    {
+      "filter": "info",
+      "email": {
+        "emails": [
+          "swiftshader-team+autoroll-info@google.com"
+        ]
+      }
+    },
+    {
+      "filter": "warning",
+      "email": {
+        "emails": [
+          "swiftshader-team+autoroll-warning@google.com"
+        ]
+      }
+    },
+    {
+      "filter": "error",
+      "email": {
+        "emails": [
+          "swiftshader-team+autoroll-error@google.com"
+        ]
+      }
+    }
+  ]
 }