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

content/browser/tab_contents/tab_contents_delegate.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_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 57 matching lines @@
   virtual TabContents* OpenURLFromTab(TabContents* source,
                                       const OpenURLParams& params);
 
   // Called to inform the delegate that the tab content's navigation state
   // changed. The |changed_flags| indicates the parts of the navigation state
   // that have been updated, and is any combination of the
   // |TabContents::InvalidateTypes| bits.
   virtual void NavigationStateChanged(const TabContents* source,
                                       unsigned changed_flags);
 
-  // Returns the set of headers to add to the navigation request. Use
+  // Adds the navigation request headers to |headers|. Use
   // net::HttpUtil::AppendHeaderIfMissing to build the set of headers.
-  virtual std::string GetNavigationHeaders(const GURL& url);
+  virtual void AddNavigationHeaders(const GURL& url, std::string* headers);
 
   // Creates a new tab with the already-created TabContents 'new_contents'.
   // The window for the added contents should be reparented correctly when this
   // method returns.  If |disposition| is NEW_POPUP, |pos| should hold the
   // initial position.
   virtual void AddNewContents(TabContents* source,
                               TabContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture);
@@ skipping 257 matching lines @@
   void Attach(TabContents* source);
 
   // Called when |this| is no longer the TabContentsDelegate for |source|.
   void Detach(TabContents* source);
 
   // The TabContents that this is currently a delegate for.
   std::set<TabContents*> attached_contents_;
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_DELEGATE_H_