When the user navigates to the home page, make sure to set the RLZ string

content/common/content_notification_types.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_NOTIFICATION_TYPE_H_
 #define CONTENT_COMMON_NOTIFICATION_TYPE_H_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
@@ skipping 25 matching lines @@
   // NavigationController ----------------------------------------------------
 
   // A new pending navigation has been created. Pending entries are created
   // when the user requests the navigation. We don't know if it will actually
   // happen until it does (at this point, it will be "committed." Note that
   // renderer- initiated navigations such as link clicks will never be
   // pending.
   //
   // This notification is called after the pending entry is created, but
   // before we actually try to navigate. The source will be the
-  // NavigationController that owns the pending entry, and there are no
-  // details.
+  // NavigationController that owns the pending entry, and the details
+  // will be a NavigationEntry.
   NOTIFICATION_NAV_ENTRY_PENDING,
 
   // A new non-pending navigation entry has been created. This will
   // correspond to one NavigationController entry being created (in the case
   // of new navigations) or renavigated to (for back/forward navigations).
   //
   // The source will be the navigation controller doing the commit. The
   // details will be NavigationController::LoadCommittedDetails.
   NOTIFICATION_NAV_ENTRY_COMMITTED,
 
@@ skipping 387 matching lines @@
   // of a temporary zoom level change, the details is an empty string.
   NOTIFICATION_ZOOM_LEVEL_CHANGED,
 
   // Custom notifications used by the embedder should start from here.
   NOTIFICATION_CONTENT_END,
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_NOTIFICATION_TYPE_H_