Add chrome://site-engagement WebUI.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc

Index: chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
diff --git a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
index 4ab4fa4e55073660b041968fd281711ae3f8f3a7..0d5c74510b66f9a200149d487f23bc61447c20c8 100644
--- a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
+++ b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
@@ -13,6 +13,7 @@
 #include "base/thread_task_runner_handle.h"
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
+#include "chrome/browser/engagement/site_engagement_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/webui/about_ui.h"
@@ -23,6 +24,7 @@
 #include "chrome/browser/ui/webui/device_log_ui.h"
 #include "chrome/browser/ui/webui/domain_reliability_internals_ui.h"
 #include "chrome/browser/ui/webui/downloads_ui.h"
+#include "chrome/browser/ui/webui/engagement/site_engagement_ui.h"
 #include "chrome/browser/ui/webui/flags_ui.h"
 #include "chrome/browser/ui/webui/flash_ui.h"
 #include "chrome/browser/ui/webui/gcm_internals_ui.h"
@@ -582,6 +584,11 @@ WebUIFactoryFunction GetWebUIFactoryFunction(WebUI* web_ui,
     return &NewWebUI<dom_distiller::DomDistillerUi>;
   }
 
+  if (SiteEngagementService::IsEnabled() &&
+      url.host() == chrome::kChromeUISiteEngagementHost) {
+    return &NewWebUI<SiteEngagementUI>;
+  }
+
   return NULL;
 }