Add a URL param to indicate group selection in Instant field trial.

chrome/browser/importer/profile_writer.cc

Index: chrome/browser/importer/profile_writer.cc
diff --git a/chrome/browser/importer/profile_writer.cc b/chrome/browser/importer/profile_writer.cc
index 087707bda02157ad88302e020d70074e1a9ac50f..efd622df5986d7b857fff64ee64da4d5b5a36b27 100644
--- a/chrome/browser/importer/profile_writer.cc
+++ b/chrome/browser/importer/profile_writer.cc
@@ -241,7 +241,8 @@ static std::string HostPathKeyForURL(const GURL& url) {
 // matches our prepopulate data. IE's URL for Live Search is something like
 // 'http://...{Language}...'. As {Language} is not a valid OSDD parameter value
 // the TemplateURL is invalid.
-static std::string BuildHostPathKey(const TemplateURL* t_url,
+static std::string BuildHostPathKey(Profile* profile,
+                                    const TemplateURL* t_url,
                                     bool try_url_if_invalid) {
   if (t_url->url()) {
     if (try_url_if_invalid && !t_url->url()->IsValid())
@@ -250,7 +251,7 @@ static std::string BuildHostPathKey(const TemplateURL* t_url,
     if (t_url->url()->SupportsReplacement()) {
       return HostPathKeyForURL(GURL(
           t_url->url()->ReplaceSearchTerms(
-          *t_url, ASCIIToUTF16("random string"),
+          profile, *t_url, ASCIIToUTF16("random string"),
           TemplateURLRef::NO_SUGGESTIONS_AVAILABLE, string16())));
     }
   }
@@ -259,11 +260,13 @@ static std::string BuildHostPathKey(const TemplateURL* t_url,
 
 // Builds a set that contains an entry of the host+path for each TemplateURL in
 // the TemplateURLService that has a valid search url.
-static void BuildHostPathMap(const TemplateURLService& model,
+static void BuildHostPathMap(Profile* profile,
+                             const TemplateURLService& model,
                              HostPathMap* host_path_map) {
   std::vector<const TemplateURL*> template_urls = model.GetTemplateURLs();
   for (size_t i = 0; i < template_urls.size(); ++i) {
-    const std::string host_path = BuildHostPathKey(template_urls[i], false);
+    const std::string host_path = BuildHostPathKey(profile, template_urls[i],
+                                                   false);
     if (!host_path.empty()) {
       const TemplateURL* existing_turl = (*host_path_map)[host_path];
       if (!existing_turl ||
@@ -287,7 +290,7 @@ void ProfileWriter::AddKeywords(const std::vector<TemplateURL*>& template_urls,
       TemplateURLServiceFactory::GetForProfile(profile_);
   HostPathMap host_path_map;
   if (unique_on_host_and_path)
-    BuildHostPathMap(*model, &host_path_map);
+    BuildHostPathMap(profile_, *model, &host_path_map);
 
   for (std::vector<TemplateURL*>::const_iterator i = template_urls.begin();
        i != template_urls.end(); ++i) {
@@ -314,10 +317,10 @@ void ProfileWriter::AddKeywords(const std::vector<TemplateURL*>& template_urls,
     // imported browser.
     if (unique_on_host_and_path &&
         host_path_map.find(
-            BuildHostPathKey(t_url, true)) != host_path_map.end()) {
+            BuildHostPathKey(profile_, t_url, true)) != host_path_map.end()) {
       if (default_keyword) {
         const TemplateURL* turl_with_host_path =
-            host_path_map[BuildHostPathKey(t_url, true)];
+            host_path_map[BuildHostPathKey(profile_, t_url, true)];
         if (turl_with_host_path)
           model->SetDefaultSearchProvider(turl_with_host_path);
         else