Set referrer for webstore inline install requests, so we can see what the top pages that use it are

chrome/browser/extensions/webstore_inline_installer.cc

 // 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.
 
 #include "chrome/browser/extensions/webstore_inline_installer.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/string_util.h"
@@ skipping 157 matching lines @@
   }
 
   GURL webstore_data_url(extension_urls::GetWebstoreItemJsonDataURL(id_));
 
   webstore_data_url_fetcher_.reset(content::URLFetcher::Create(
       webstore_data_url, content::URLFetcher::GET, this));
   Profile* profile = Profile::FromBrowserContext(
       tab_contents()->browser_context());
   webstore_data_url_fetcher_->SetRequestContext(
       profile->GetRequestContext());
+  // Use the requesting page as the referrer both since that is more correct
+  // (it is the page that caused this request to happen) and so that we can
+  // track top sites that trigger inline install requests.
+  webstore_data_url_fetcher_->SetReferrer(requestor_url_.spec());
   webstore_data_url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                                            net::LOAD_DO_NOT_SAVE_COOKIES |
                                            net::LOAD_DISABLE_CACHE);
   webstore_data_url_fetcher_->Start();
 }
 
 void WebstoreInlineInstaller::OnURLFetchComplete(
     const content::URLFetcher* source) {
   CHECK_EQ(webstore_data_url_fetcher_.get(), source);
   // We shouldn't be getting UrlFetcher callbacks if the TabContents has gone
@@ skipping 234 matching lines @@
   if (tab_contents()) {
     if (error.empty()) {
       delegate_->OnInlineInstallSuccess(install_id_);
     } else {
       delegate_->OnInlineInstallFailure(install_id_, error);
     }
   }
 
   Release(); // Matches the AddRef in BeginInstall.
 }