Add chrome://site-engagement WebUI.

chrome/browser/ui/webui/engagement/site_engagement.mojom

Index: chrome/browser/ui/webui/engagement/site_engagement.mojom
diff --git a/content/public/common/service_worker_event_status.mojom b/chrome/browser/ui/webui/engagement/site_engagement.mojom
similarity index 50%
copy from content/public/common/service_worker_event_status.mojom
copy to chrome/browser/ui/webui/engagement/site_engagement.mojom
index 020d0e82e88cbb9dd52b2cf53651b629136a8910..13acd60fb8fee7cb7f22eb23f4fd7e0b3e3c8bf4 100644
--- a/content/public/common/service_worker_event_status.mojom
+++ b/chrome/browser/ui/webui/engagement/site_engagement.mojom
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module content;
+struct SiteEngagementInfo {
+  string origin;
+  int32 score;
+};
 
-enum ServiceWorkerEventStatus {
-  COMPLETED,
-  REJECTED,
-  ABORTED,
-  MAX=ABORTED
+interface SiteEngagementUIHandlerMojo {

[Sam McNally, 2015/09/08 08:25:47]

The current convention is to call this SiteEngagementUIHandler and name the
implementation SiteEngagementUIHandlerImpl.

[calamity, 2015/09/10 06:57:33]

Done.

+  GetSiteEngagementInfo() => (array<SiteEngagementInfo> info);
 };