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 6fd567bf617ac396f9f7a7256993e80898ed3f48..2770ae5b2c2145927eeda2797e265a40023716f2 100644
--- a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
+++ b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
@@ -23,6 +23,7 @@
 #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"
@@ -537,7 +538,6 @@ WebUIFactoryFunction GetWebUIFactoryFunction(WebUI* web_ui,
     return &NewWebUI<ProfileSigninConfirmationUI>;
 #endif
 #endif  // defined(ENABLE_CONFIGURATION_POLICY)
-
 #if defined(ENABLE_APP_LIST)
   if (url.host() == chrome::kChromeUIAppListStartPageHost)
     return &NewWebUI<app_list::StartPageUI>;
@@ -577,6 +577,11 @@ WebUIFactoryFunction GetWebUIFactoryFunction(WebUI* web_ui,
     return &NewWebUI<dom_distiller::DomDistillerUi>;
   }
 
+  if (switches::SiteEngagementServiceEnabled() &&
+      url.host() == chrome::kChromeUISiteEngagementHost) {
+    return &NewWebUI<SiteEngagementUI>;
+  }
+
   return NULL;
 }