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

chrome/browser/ui/views/default_search_view.cc

Index: chrome/browser/ui/views/default_search_view.cc
diff --git a/chrome/browser/ui/views/default_search_view.cc b/chrome/browser/ui/views/default_search_view.cc
index da1a8c5b2446e56ebd5c5cf526a4df29ec9fe3fe..0e7420f93eb6ac643776519cdff8266125099975 100644
--- a/chrome/browser/ui/views/default_search_view.cc
+++ b/chrome/browser/ui/views/default_search_view.cc
@@ -30,16 +30,19 @@
 namespace {
 
 // Returns a short name and logo resource id for the given host.
-void GetShortNameAndLogoId(PrefService* prefs,
+void GetShortNameAndLogoId(Profile* profile,
                            const TemplateURL* turl,
                            std::wstring* short_name,
                            int* logo_id) {
-  DCHECK(prefs);
+  DCHECK(profile);
   DCHECK(turl);
   DCHECK(short_name);
   DCHECK(logo_id);
 
-  GURL url = TemplateURLService::GenerateSearchURL(turl);
+  PrefService* prefs = profile->GetPrefs();
+  DCHECK(prefs);
+
+  GURL url = TemplateURLService::GenerateSearchURL(profile, turl);
   scoped_ptr<TemplateURL> built_in_data(
       TemplateURLPrepopulateData::GetEngineForOrigin(prefs, url));
 
@@ -189,14 +192,13 @@ DefaultSearchView::DefaultSearchView(TabContents* tab_contents,
       template_url_service_(template_url_service) {
   Profile* profile =
       Profile::FromBrowserContext(tab_contents->browser_context());
-  PrefService* prefs = profile->GetPrefs();
-  SetupControls(prefs);
+  SetupControls(profile);
 
   // Show the dialog.
   tab_contents->CreateConstrainedDialog(this);
 }
 
-void DefaultSearchView::SetupControls(PrefService* prefs) {
+void DefaultSearchView::SetupControls(Profile* profile) {
   using views::ColumnSet;
   using views::GridLayout;
   using views::ImageView;
@@ -210,7 +212,7 @@ void DefaultSearchView::SetupControls(PrefService* prefs) {
   // Set up the information for the proposed default.
   std::wstring proposed_short_name;
   int proposed_logo_id = kNoSearchEngineLogo;
-  GetShortNameAndLogoId(prefs,
+  GetShortNameAndLogoId(profile,
                         proposed_turl_.get(),
                         &proposed_short_name,
                         &proposed_logo_id);
@@ -221,7 +223,7 @@ void DefaultSearchView::SetupControls(PrefService* prefs) {
   // Set up the information for the current default.
   std::wstring default_short_name;
   int default_logo_id = kNoSearchEngineLogo;
-  GetShortNameAndLogoId(prefs,
+  GetShortNameAndLogoId(profile,
                         template_url_service_->GetDefaultSearchProvider(),
                         &default_short_name,
                         &default_logo_id);